Open source machine learning and data visualization for novice and expert. Interactive data analysis workflows with a large toolbox. Perform simple data analysis with clever data visualization. Explore statistical distributions, box plots and scatter plots, or dive deeper with decision trees, hierarchical clustering, heatmaps, MDS and linear projections. Interactive data exploration. Add-ons available.
Source code for the Gotify Android client application. Can also be installed from the Play or F-Droid stores.
Text mode window environment. A "retro" program for embedded or remote systems, that doubles as X11 terminal and text-mode equivalent of VNC server. It's a serious oversimplification, but think text-mode X, or maybe something like Desqview for DOS. Mouse support, window manager, terminal emulator and networked clients, all inside a text display.
An introduction to the Flask web framework for Python. Also describes how to turn it into a "real" installed project with setup.py.
One of the earliest (and still maintained) F/OSS IM applications out there. Interfaces with most of the communication networks out there. Has a plugin architecture as well.
A daemon that runs on a *nix machine that simulates a network of other systems (of many different operating systems) for the purposes of catching and monitoring intruders.
A searchable database of ports and protocols, and the applications that they map to.
networking tcp-ip ports database search web application daemons
Possibly the most awesome open source music library management system that I've ever used - written in Python, it can import thousands of tracks into its database, along with CDDB information. It even manages my collection of radio shows, tracking down episode information as necessary.
textfiles.com now offers the contents of entire BBS file and shareware CD-ROMs for download. Some of these are quite famous.
An open source web server and web application scanner that tests for misconfigurations, bugs, and missing patches. Not designed to be subtle, it's a pen tester's auditing tool through and through.