Tucows (originally an acronym for The Ultimate Collection Of Winsock Software, a name which has long since been dropped) . It has a popular website directory of shareware, freeware, and demo software packages available to download.
A system of mirror sites are maintained to allow the traffic to the site to be distributed among several world-wide server locations. Tucows has software for many major computer platforms including Windows, Linux and Macintosh, and also older versions of Windows (most notably the Windows 3.x series). They also cover web-based Apps and Services.