Free and open source chess database
Version: 3.6.19 Beta 1 / 3.6.18ChessDB is a free chess database which can be used on Apple Macs running OS X, Microsoft Windows, Linux, FreeBSD, as well as most if not all modern UNIX versions.
Operating System: Mac OS X
The program has translations into English, Spanish, Norwegian, Polish, Portuguese, Czech, Dutch, French, German, Hungarian, Italian, Russian, Serbian and Swedish.
The documentation is excellent, although currently most is only in English, but this situation is changing rapidly.
ChessDB is based very heavily on the highly successful Scid which was the premier free chess database. There are a large number of features in ChessDB. It is not a cut-down/light/crippled (call it what you want) version of an expensive commercial product, but you get a complete fully functional program.