The European Space Software Repository (ESSR) is an ESA informational web portal created to promote reuse of Software - including Open Source Software (OSS) - and to provide all parties involved in the European Space software development (in particular SMEs) with access to results of previous investments.
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available projects

opus (PUS-C Tooling)

The opus toolset, previously known as PUS-C-Gen allows to work with the PUS-C Standard, in particular: - Instantiate and tailor the standard for a new mission - C...

Updated on: 20/01/2021
Created on: 20/01/2021
Version Control System: git
Owner: ESA
SSAT (Sector Shielding Analysis Tool)

The Sector Shielding Analysis Tool (SSAT) performs ray-tracing from a user-defined point within a given Geant4 geometry to determine shielding profiles (i.e. the fr...

Updated on: 02/11/2020
Created on: 02/11/2020
Open Source Software Resources for Space Downstream Applications

This webpage provides a list of open source software resources for developing space downstream applications, in the following categories: Positioning & Navigat...

Updated on: 19/10/2020
Created on: 11/06/2020
RATIO-SIM (Rationalisation of Simulators)

  The specification, design and verification of modern space systems rely heavily on the use of system modelling and simulation, in support of the space systems e...

Updated on: 10/09/2020
Created on: 21/04/2020
MB4SE (Model Based For System Engineering)

Space industry and Agencies have recognized already for quite some time the interest and added value of Model-Based System Engineering (MBSE) in streamlining the de...

Updated on: 02/02/2021
Created on: 10/04/2020
Unified GNSS Ionosphere

ESA UGI is an open source program package that allows the computation of the vTEC from GNSS observables. The aim is to give to the ionospheric community a starting ...

Updated on: 02/11/2020
Created on: 08/04/2020
Version Control System: git
Owner: ESA
GAFE - Generic AOCS/GNC Techniques & Design Framework for FDIR

GAFE is the abbreviation for "Generic AOCS/GNC Techniques & Design Framework for Failure Detection, Isolation and Recovery" and the name of the framework develo...

Updated on: 04/11/2019
Created on: 01/11/2019
Owner: ESA

MULASSIS is a Geant4-based M-C simulation based tool for dose and particle fluence analysis associated with the use of radiation shields. Users can define the shiel...

Updated on: 08/12/2019
Created on: 07/06/2019
Files attached to the web site ""

This project includes all the files that are pointed by the web pages: "" The files that can be do...

Updated on: 06/03/2020
Created on: 03/06/2019
ERC32 and SIS

SPARC instruction simulator (SIS) SIS(sis-3.0.5, 07-07-1999) is a SPARC instruction simulator developed at ESTEC. This simulator emulates an ERC32 system, containi...

Updated on: 03/06/2019
Created on: 26/04/2019
Owner: various