MetaData Games is described as 'Metadata Games is a digital gaming platform for gathering data on photo, audio, and moving image artifacts. The platform entices players to visit archives and explore humanities content while contributing to vital records' and is an website in the Education & Reference category. There are five alternatives to MetaData Games, not only websites but also apps for Android. The best alternative is Crowdsource, which is free. Other great sites and apps similar to MetaData Games are ARTigo (Free), Book Tag (Free), Ships Tag (Free) and Museum Metadata Games (Free, Open Source).
ARTigo is an online game with the aim to supply artworks with tags. The same artwork is simultaneously shown to you and a co-player. The game now consists in describing the artwork accurately with tags.