XFLR5 is an analysis tool for airfoils, wings and planes operating at low Reynolds Numbers. It includes:

Maven is a software project management and comprehension tool. Based on the concept of a project object model (POM), Maven can manage a project's build, reporting and documentation from a central piece of information.

This is Quisk, a Software Defined Radio (SDR). You supply an antenna and a complex (I/Q) mixer to convert the radio spectrum to a low IF. Then send that IF to your computer using the sound card, Ethernet or USB. The Quisk software will read the I/Q data, tune it, filter it, demodulate it, and send the audio to headphones or speakers. Quisk has a microphone input and a key input so it can operate as a complete transceiver.

Merkaartor is a map editor for OpenStreetMap.org, the free editable map of the whole world.

Liquid War is an original multiplayer wargame. There are no weapons, the only thing you have to do is to move a cursor in a 2-D battlefield. This cursor is followed by your army, which is composed by a great many little fighters, represented by small colored squares. When fighters from different teams meet, they eat each other, it is as simple as that.

MP3 Diags is a GUI-based application that allows end-users to identify issues with their MP3 files, fix some of the issues and make other changes, like adding track information. It also allows user to "look inside" an MP3 file.