Crowdfunding site for Open Source Software projects. Unlike other sites, it is designed to attract contributions from businesses as well as individuals.

DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client (e.g. Thunderbird with Lightning or Apple iCal) with an Exchange server, even from the internet or behind a firewall through Outlook Web Access. DavMail now includes an LDAP gateway to Exchange global address book and user personal contacts to allow recipient address completion in mail compose window and full calendar support with attendees free/busy display.

Encryption tool for data on external media (e.g. USB sticks) for Windows, Mac OS X and Linux.

Another GNSS software receiver, written in C++ and licensed under GPL 3.0.

Windows applications or source code for various numerical algorithms, with emphasis on polynomial root finding. Some algorithms can be used via a web interface.

Interesting observation on the hungarian notation as it was originally intended,

XPP (XPPAUT is another name; I will use the two interchangeably) is a tool for solving * differential equations, * difference equations, * delay equations, * functional equations, * boundary value problems, and *stochastic equations.

Zotero [zoh-TAIR-oh] is a free, easy-to-use tool to help you collect, organize, cite, and share your research sources. It lives right where you do your work: in the web browser itself.

Tarsnap is a secure online backup service for BSD, Linux, OS X, Solaris, Cygwin, and can probably be compiled on many other UNIX-like operating systems.

Another open-source RTOS. Unlike others, it comes with a task state diagram.