LoreGen
Current version: 0.11
LoreGen is currently available as a free download through the LoreGen Worldbuilder, which uses LoreGen to build worlds and lets you view and explore these worlds.
A development version of LoreGen will be released in future versions.
Histories and Heroes (LoreGen Legacy)
Histories and Heroes is the old version of LoreGen. You can read about it here.
It is available as a free download here.