McStas is a tool for carrying out Monte Carlo ray-tracing simulations of neutron scattering instruments with high complexity and precision. The simulations can compute all aspects of the performance of instruments and can thus be used to optimize the use of existing equipment, design new instrumentation, and carry out virtual experiments for e.g. training, experimental planning or data analysis.

OpenDSP is an open source signal processing library. It contains methods and routines for signal processing in imaging and radio astronomy.

This is the GNU Objective-C compiler, which compiles Objective-C on platforms supported by the gcc compiler.

OnionShare lets you securely and anonymously share a file of any size with someone. It works by starting a web server, making it accessible as a Tor hidden service, and generating an unguessable URL to access and download the file. It doesn't require setting up a server on the Internet somewhere or using a third party filesharing service. You host the file on your own computer and use a Tor hidden service to make it temporarily accessible over the Internet. The other user just needs to use the Tor Browser and TO Enter the URL to download the file from you.

This is the GNU Modula-2 standard library that comes with the gm2 compiler.

This is the GNU Modula-2 standard library that comes with the gm2 compiler.