Used a type of pre-release funding model where those who pre-order the game (fund it) during its development phase get their hands on alpha, beta, and other very early development builds as they're made.
Name variations: Early Access
The only realiable thing about this funding model is that those who buy the game at the very least get a prototype if not the final game if the developer flops financially during the development phase.
Following services are known to allow/aid alpha funding: Desura, Steam, and Humble Store. Crowdsourcing also commonly employs alpha funding.
The first Alpha funding video game was released in 2011.
|A||2009 - Minecraft alpha release|
|B||2013 - Steam Early Access launched|