Arduino 1.5.5 BETA: Windows, Windows Installer, Mac OS X, Linux: 32 bit, 64 bit, source
Arduino 1.5.4 BETA: Windows, Windows Installer, Mac OS X, Linux: 32 bit, 64 bit, source
Arduino 1.5.3 BETA: Windows, Windows Installer, Mac OS X, Linux: 32 bit, 64 bit, source
Arduino 1.5.2 BETA: Windows,Mac OS X, Linux: 32 bit, 64 bit, source
Arduino 1.5.1 BETA: Windows,Mac OS X, Linux: 32 bit, 64 bit, source
Arduino 1.5 BETA: Windows,Mac OS X, Linux: 32 bit, 64 bit, source
Arduino 1.0.4: Windows,Mac OS X, Linux: (32 bit, 64 bit), source- hosted by Google Code