Here you can download the latest version of the openBVE main program.
Please make sure that you also have all the additional dependencies listed on each version's respective download page.
You can also download ObjectViewer, RouteViewer, Objectbender and Train Editor, essential tools for train and route development for openBVE.

Windows XP & Later
Not compatible with Windows RT Tablets!
Most Major Linux Distributions (Ubuntu, Fedora, Slackware, Etc.)
Not compatible with ARM-based systems
OS X 10.5.8 & Later, Intel Macs
Not compatible with PowerPC Macs
Developer Tools
Object Viewer, Route Viewer, Train Editor & Object Bender
Source Code 
The inner workings of openBVE is freely available
Routes, Trains, Plug-ins, etc.