These notable open source apps prove how useful open source can be, from creating your own racecourse to contributing to science
"Open source software is always in flux, and new projects are being born every day. Open Source principles are spreading beyond software to not only include code, but in some cases, code that is being used to write an open source book or to do open source science where anyone is welcome to participate. And, cross-platform or platform-independent apps that work on any operating system are becoming much more common than those designed for a particular OS. We like to shine a spotlight on those that seem particularly noteworthy, but there are plenty more that didn't get included. If you know of one, please make a note in the comments section below..."