What is it?

First Age Angband.  It’s a roguelike game, a variant of Oangband, which in turn is a variant of Angband.

Where do I get it?

Right here!  The latest version, FAangband 1.4 is available compiled for Windows, Macintosh OSX, several Linux flavours or as source code, and FAangband 1.1 for WindowsCE and Nintendo DS.  The latest source code is at the FAangband project page.

Where do complain about it?

Bugs can be filed at github.

Is there anything like it?

Yes.  Here are some links.

Is that it?

No!  There are no definite plans for changes to FAangband, but there is Beleriand.  For more FA discussion, look at the current thread on the Angband forums.