Besiege Downloads is a repository of machines, as uploaded by their creators in a '.bsg' file , for a PC game called Besiege. Read More
Besiege is a physics based puzzle game made by Spiderling Games and is currently in alpha. It is available on Steam as an Early Access Game. BSG files are made by Besiege when you save your machine, vehicle, or creation. They can be opened and modified with a text editor just like a text file (it uses an XML format), but it's not very straightforward to do so.
You can use any saved machines found here by downloading the .bsg file and saving it to the "SavedMachines" folder inside the Besiege installation folder. It is often located here: