PeerProject is a versatile peer-to-peer filesharing client and file manager. It's intuitive and aesthetic while supporting many networks and features, including BitTorrent, G2, Gnutella, eDonkey, DC++, IRC, HTTP/FTP, and more. It's a mainstream fork of Shareaza p2p, for Windows and WINE.
TinyIB is a lightweight PHP image board which emulates the functionality of 4chan. If you use MySQL or SQLite, you can use it to create an efficient setup able to handle large amounts of traffic. If you don't use a database, it can store posts as text files for a portable setup capable of running on virtually any PHP host.
QMentat helps you practice mental arithmetic. It uses arbitrary-length fixed point arithmetic, and can handle any size numbers, only limited by the size of your screen (and in the case of division with an integer result, the speed at which the number can be factored). It is also quite configurable, allowing you to tailor the questions to your needs.
MetaPath is a tool for the analysis of metabolic pathways and associated visualization of experimental data. Built on the MetaCyc database, it provides an interactive map in which multiple pathways can be simultaneously visualized. Multiple annotations from the MetaCyc database are available, including synonyms, associated reactions and pathways, and database unification links. Metabolomics change data can be imported via simple CSV formats for visualization on targeted pathways. Pathways can be mined and removed algorithmically to identify key regulated pathways within a given dataset, providing a simper route to metabolic functions.
PinaCart is a webshop constructor. Use it as a shopping cart engine to create a chain of online stores or build your own SaaS ecommerce platform and allow your clients to create and manage their online stores. Just download and install PinaCart to start getting clients, then you can customize and expand the software, develop and sell your own set of skins and templates, and come up with new features and functionality.