LiveCode producers RunRev have released a free and open sourced (GPL v3) version of their multi platform application development software. The software which can produce apps for IOS, Android, Linux, OSX and Windows is for non-commercial use as any apps created must also be distributed as open source. One downside of this is that you cant host apps on the Apple App store as the GPL licence is incompatible with the App Store terms and conditions (if you are a student and wish to distribute your application for free on the App Store, RunRev will make dispensation and change the applications license if you ask them).
LiveCode also comes as a paid edition for those of you who wish to sell your creations including on the Apple App Store. To find out more about LiveCodes features and download the community edition or purchase the commercial version further information is available on RunRev’s website.