GSOC2017 Ideas

Από Ελεύθερο Λογισμικό / Λογισμικό ανοιχτού κώδικα
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GFOSS will be a mentor- organisation for GSOC 2017. Students interested to participate should check which of the following projects fits their interests and skills. Practical information for students

Proposed Projects for GSOC 2017



Brief Explanation:

Synnefo ( is a complete open source cloud stack written in Python that provides Compute, Network, Image, Volume and Storage services. Synnefo exposes an OpenStack-derived API that can be used for third party clients, and is used for its own graphical user interface that powers the Okeanos public cloud infrastructure ( Synnefo manages multiple Ganeti clusters at the backend for handling low-level VM operations and can use different storage backends.

Related GitHub repositories:

Expected Results:

Telemetry (implementation of OpenStack Telemetry / Ceilometer)

Multidatacenter integration

Physical node administration Management Web Console (Add, remove, update a physical node)

Network Management Console

Knowledge Prerequisites:

· Python

· Ganeti

· OpenStack API

· Ceph, Gluster, DRBD

Mentors: Panos Louridas,Georgios Tsoukalas

The Transparency Program initiative - Diavgeia

Brief Explanation:

Diavgeia is a PHP application with a Mysql backend that is used in order to upload documents to an online public repository. This version of code was used by the Greek government from 2010-2014 as the main repository of public decisions and acts. Each document is digitally signed and assigned a unique Internet Uploading Number (IUN). The application consists of concrete frontend and backend with different databases for security and perfomance reasons.

Related GitHub repositories:

Expected Results:

Rewrite the backend application in a modern framework

Create forms to write online the decisions and acts and produce fully metadata documents of structured data

Knowledge Prerequisites:


· Mysql

Mentors: Alexios Zavras,Panagiotis Kranidiotis


Brief Explanation:

Agora is a 3-tier application for consists on a

Frontend PHP application in Yii Framework

Middleware API on Spring Framework

MySQL Databases on High Availability

This version of code was used by the Greek government from 2012-2014 as the main repository of public decisions,  RFP’s, contracts and invoices public procurement. Each document is digitally signed and assigned a unique Internet Uploading Number (IUN). Agora fulfill the workflow for a procurement by the time of the announcement till it’s payment.

Expected Results

Automation to the installation process.

Packaging to main linux distributions.

Creating national and international (ie europeans) profiles of workflow process.

Related GitHub repositories:

Knowledge Prerequisites:

PHP - Yii Framwork

Java - Spring Framework


Basic Legals about procurements

Mentors:Alexios Zavras,Panagiotis Kranidiotis


Brief Explanation:

netdata is a system for distributed real-time performance and health monitoring. It provides unparalleled insights, in real-time, of everything happening on the system it runs (including applications such as web and database servers), using modern interactive web dashboards. netdata is ideal for monitoring physical servers, VMs, VPS, containers, IoT.

netdata is highly active project, with hundreds of new users joining and hundreds of new installations completed, every day. netdata is also featured as one of the top github projects for 2016 (

Key components of netdata:

1. netdata daemon, its core, written in C, an asynchronous I/O, time-series database and web server, optimized for performance.

2. web dashboards, written in Javascript, HTML, CSS

3. external plugins, written in python, node.js, bash, C

netdata is the definition of full-stack development. It includes low-level C programming following embedded development principles, web-apps development for visualizing performance metrics, devops and sysadmin automation tasks for configuring health monitoring (alarms), statistical analysis of metrics, high level development for data collection from databases and third party apps, etc.

Related GitHub repositories:

Expected Results

These are the main development directions

1. add more data collection plugins in any computer language, for monitoring the performance of popular third party applications.

2. add more data visualizations and dashboards.

3. add more health monitoring alarms, for monitoring popular applications and operating systems.

4. port netdata to more operating systems.

5. improve the distribution of netdata by setting up and maintaining binary packages for popular distributions.

6. improve the technical documentation of netdata (setup guides, how-tos for monitoring applications or functions, etc).

7. help spreading netdata, by improving the community and social media reach of netdata.

More ideas can be found at the netdata github repo

Knowledge Prerequisites:

Depending on the task in hand, different skills are required.

For example:

1. low level C programming (POSIX compliant, including pthreads)

2. python programming

3. node.js programming

4. web-app development (javascript, html, css)

5. bash scripting

6. linux system administration

Mentors: Costa Tsaousis, Diomidis Spinellis


Brief Explanation:

Zeus is an open source e-voting platform (online service available at: It enables secure, verifiable elections, with client-side ballot encryption and anonymity guaranteed through cryptographic mixing networks (mixnets). Zeus has already been used in hundreds of elections with tens of thousands of voters.

Related GitHub repositories:

Example Improvements:

Better management/reporting of cryptographic identifiers and proofs

Zeus employs cryptographic identifiers and proofs to create a secure log of the entire voting process. These can be used to audit the election after it has been completed and verify that the election protocol has been executed correctly.

This information, however, has to be presented to the voters and trustees at various stages in the process, and especially at the end, when they have to be recorded into official documents publishing the results.

We would like to enhance security and safety by making better use and better presentation of the available cryptographic information.

For example we could upgrade a cryptic hexadecimal fingerprint at the bottom of the page into a button that will provide a detailed report about the process for auditing or (expert) user inspection, or we could include more validations concerning cryptographic fingerprints into the browser code implementing the voting booth.

Mixnet Implementations

The core operation that ensures both integrity and secrecy for e-voting is the mixnet. Zeus employs a re-encryption mixnet protocol that shuffles and re-encodes ballots to make them untraceable to the voter that submitted them while providing a proof that the shuffled votes are indeed equivalent to the original ones.

This is a complex and very computationally expensive operation. Better and faster protocols exist. Not all of the available mixnet protocols are appropriate for use in Zeus, but we are considering a few of them.

In this context, Zeus is participating in a research project that aims to provide (among other privacy-enhancing solutions) a re-encryption mixnet appropriate for e-voting. You can learn more  about the project here:

Therefore we seek to implement or enhance or test different mixnets in order to replace the current mixnet algorithm in Zeus.

Better PDF Generation and Mobile-friendly Browser View

Zeus supports a lot of different voting systems and quite complex formats for ballots. We would like to enhance the experience of users by making all this complexity understandable and pleasantly presentable.

Zeus can already be used on mobile devices, but the experience can be improved. Mobile devices are increasingly popular, and we assume that participation to elections would get a boost if we make it easy for users to follow and vote for an election while they are on the run.

As a second step, of course, the fact that handheld devices are personal can help us enhance the overall security of the application.

Voting Systems and Ballots Specification

Zeus supports a variety of voting systems (approval voting, scored voting, ranked voting) and ballots with simple questions or more complicated designs. We would like to develop a specification to describe voting systems, ballot designs, and cryptographic protocols, so that whole elections can be set up by using descriptions based on this specification.

Separation in multiple independent services (Booth / Ballot box / Registry)

Currently Zeus is operating from a single server. However, the e-voting process comprises several distinct components.

  • The electoral registry that lists and authenticates voters.
  • The voting server that creates and manages the voting process.
  • The voting booth that records the voter's choices and encrypts them on the voter's computer.
  • The mixnet servers that perform the anonymization of votes.

We are already working on some of them but there is a lot of work to be done. The separation into independent components can offer maintainability, flexibility to extend Zeus to support more workflows, even beyond strictly voting (e.g. auction bidding), and most importantly, it can offer better security by allowing different parties to control different components.

Port Cryptographic Workflow to Elliptic Curves

Zeus uses integer modulo prime arithmetic to construct its cryptosystem. Elliptic curve cryptography may provide some advantages in terms of security or efficiency and we would like to port Zeus cryptography on elliptic curves.

Knowledge Prerequisites

  • Python
  • C, C++
  • Cryptography
  • JavaScript, if interested to work on the front-end components

Also possibly interested in Go, Rust.

Mentors: Panos Louridas, Georgios Tsoukalas, Dimitris Mitropoulos

Linked Economy: a framework for Economic Linked Open Data

Brief Explanation:

Linked Economy ( provides a common understanding on what data are available and how they can be orchestrated to provide relevant insights on e-government topics. The project has included data from European and other governments and can be scalable to include any similar content from around the world (e.g. UNdata, a data access system to UN databases - The Linked Economy platform provides an innovative and value-added resource base for research and education for information technologies in the field of public governance (e-government) employed by lawyers, social scientists and technologists

Related GitHub repositories:

Expected Results

The main extensions should focus in three directions: to analyse and semantically annotate new datasets according to the LinkedEconomy data model and to provide a richer set of online visualizations for our vast amount of data to extract and semantically annotate data that are included in downloaded pdfs

Knowledge Prerequisites:

· Knowledge Representation: XML, RDF, RDFS, OWL

· Query Languages: SPARQL

· Rules and inference engines: Jena Rules και Description Logic

· Semantic Web Frameworks: Jena και Virtuoso

· Triplestores: Virtuoso

· Services: Restful web services και SPARQL End Points

· Ontology development environments: Protégé

· Scalable Architectures: distributed architectures, noSQL, Linked Data

· Metadata manipulation & scripting languages: Java και PHP

· Search platform: Apache SOLR

· Database: Apache CouchDB

· Cloud Service: GRNET Cyclades (

· Concurrent Versions System: Git και Bitbucket

· Issue Tracking Systems & collaboration: GitHub

Mentors: Michalis Vafopoulos, Ioannis Stamelos

Donation Box

Brief Explanation:

An open-source screen enabled donation box

The software has three items.

The Serial2DB which is a simple daemon written in python which listens on the serial port for messages from the Arduino which is connected to the coin acceptor and writes all entries to an SQL DB.

The wsServer which is a WebSocket server written in python which reads the SQL DB for new entries and then notifies any connected websocket clients of these. Additionally listens for any donations made and alters accordingly the SQL DB.

The Wordpress widgets and theme customizations. Which are used for offering an improved user experience based on the design assumption that the wordpress site is running on a 10" tablet. The theme is currently based on Influence and there are several widgets developed to enhance the sidebar. Several plug-ins needed for the current implementation and features are already under the plug-ins folder.

Related GitHub repositories:

Expected Results

Feature 1 - Improve Custom Wordpress theme

Feature 2 - Donation Box customizations in Wordpress as a plug-in

Feature 3 - P2P or Client - Server, P2P or Client - Server

Feature 4 - DonationBox online platform

Feature 5 - Hardening (Security improvements)

Knowledge Prerequisites:

Feature 1 - Wordpress, Javascript, CSS

Feature 2 - PHP, Wordpress

Feature 3 - Client-Server Communication, SQL, REST API (Preferably: Python)

Feature 4 - PHP, Wordpress, Javascript

Feature 5 - PHP, Python, Linux

Mentors: Panagiotis Kranidiotis, Kostas Papadimas, Dimitris Koukoulakis

Software components and IP management

More details in the separate page Clio.

Brief Explanation

A web-based system to manage data on software components and their relations.

Nowadays every piece of software is including and using many other software components, each one coming with their own license.

The goal of this project is to build a simple web system to be able to (manually) input and maintain this information!

This is a brand-new project; some analysis has been done but no code is available yet.

Expected Results

A complete web-based system to manage the above-mentioned data.

Knowledge Prerequisites

Web (any technology welcome)

Mentors: Alexios Zavras

Files DB

More details in the separate page FilesDB.

Brief Explanation

A system to keep meta-data for a large number of files.

The files that are to be processed can be on the filesystem, in archives, or parts of a (git) repository. The metadata are mainly information about the contents (size, type, hashes, ...), so that afterwards a number of questions can be asked about the actual files: how many files, how many files larger than X, how similar are two archives/repositories, when was a file introduced in a repository, etc.

This is a brand-new project; some analysis has been done but no code is available yet.

Expected Results

A software to collect the data from the input files and a collection of commands to query the data. These can all be command-line utilities; it would be worthwhile to also provide a Web interface, although it is not necessary.

Knowledge Prerequisites

C and/or Python; SQL; Git (and other systems); web

Mentors: Alexios Zavras

Addition of Greek glyphs in Open Source Fonts

Brief Explanation

Many of the Open Source fonts (e.g., available at, do not include glyphs for Greek letters and are therefore useless for using in a Greek environment.

The aim of this project is to imporve this situation and add the missing glyphs in the correct Unicode codepoints.

The exact set of fonts to be completed will be determined in discussions between the student and the mentor(s).

This is not a typical programming project. If you have never designed fonts before, it is probably not for you.

Expected Results

Full support for Greek text in a number of Open Source fonts.

Knowledge Prerequisites

Type design, font technologies. Please note that this is a special project, where coding, in the traditional sense, will not be enough.

Mentors: Alexios Zavras, Irene Vlachou

CScout AJAX-based Interface

Brief Explanation

CScout is a source code analyzer and refactoring browser for collections of C programs. It can process workspaces of multiple projects (a project is defined as a collection of C source files that are linked together) mapping the complexity introduced by the C preprocessor back into the original C source code files. CScout takes advantage of modern hardware (fast processors and large memory capacities) to analyze C source code beyond the level of detail and accuracy provided by current compilers and linkers. The analysis CScout performs takes into account the identifier scopes introduced by the C preprocessor and the C language proper scopes and namespaces. CScout has already been applied on projects of tens of thousands of lines to millions of lines, like the Linux, OpenSolaris, and FreeBSD kernels, and the Apache web server.

The aim of this project is to redesign the current web interface, which is based on HTML forms generated by C++ code, into a responsive AJAX-based one. Under this scheme the C++ code will provide JSON data through a RESTful interface, which the JavaScript front-end will use.

Expected Results

A modern responsive web interface offering the current capabilities of CScout. Ideally this would include in-line editing of identifiers.

Related GitHub repository:

Knowledge Prerequisites

  • C++
  • JavaScript
  • A modern development framework for interactive web content

Mentor: Diomidis Spinellis