For OpenTTD you can use the original Transport Tycoon Deluxe data files (you need to own a Transport Tycoon Deluxe CD). There are also the free alternatives: OpenGFX (graphics), OpenSFX (sound) and OpenMSX (music). These can be installed automatically by the Windows and OS/2 installers. Please refer to the readme for more information.
For all binaries officially released by us we publish the MD5, SHA1, and SHA256 checksums. You can use these checksums to check wheter the file you downloaded has been modified. All three checksums should match the file you downloaded; if this is not the case it means that either the file didn't come from us or that it got broken during transport. Either way it might possibly contain dangerous modifications and the file should therefore not be trusted!
Latest release in openttd-useful is 5.1, released on 2013-05-28 19:30 UTC.
[ 26.0 MiB ][ Checksums ]md5sum : a3005f79f03a07c9445e30c240138d41
sha1sum : def2bd31842352c3d033f39c94df8fe22ebb0b72
[ 26.2 MiB ][ Checksums ]md5sum : b3351474562b10ef91e87ed759623b45
sha1sum : 093d7177ded00fdf5240c09b52e7091f448d25f8