Developers, Publishers, and Platforms

The title pretty much says it all! I found this information off of Wikipedia.

Developers:

Black Isle Studios

Micro Forte
Bethesda Game Studios
Obsidian Entertainment

Publishers:

Interplay
14 Degrees East
Bethesda Softworks

Platforms:

Microsoft Windows, Mac OS X,PlayStation 2, PlayStation 3, Xbox,Xbox 360

Basic Game Info

Here is some of the basic game info and a brief description of the series. Then the issue of spinoffs and the developers for each individual game (according to Wikipedia)

Fallout is a series of role-playing games (RPGs) published by Interplay and, later, Bethesda Softworks. Although set in and after the 22nd and 23rd century, its story and artwork are influenced by the post-warculture of 1950s America, and its combination of hope for the promises of technology and lurking fear of nuclear annihilation. The series is sometimes considered to be an unofficial sequel to Wasteland, but it could not use that title as Electronic Arts held the rights to it, and, except for minor references, the games are set in separate universes.

The first two titles in the series (Fallout and Fallout 2) were developed by Black Isle Studios, and had stronger roleplaying characteristics than the subsequent two spin-offs. Micro Forté and 14 Degrees East'sFallout Tactics: Brotherhood of Steel of 2001 was a tactical role-playing game. In 2004, Interplay, having closed Black Isle Studios,^[1] brought out an action game with RPG elements for PlayStation 2 and Xbox,Fallout: Brotherhood of Steel. A third entry in the main series, Fallout 3, was released in 2008 by Bethesda Softworks. Bethesda now owns the rights to make all Fallout games,^[2][3] and has conditionally licensed the rights to make a massively multiplayer online role-playing game version of Fallout to Interplay. A new Falloutgame called Fallout: New Vegas is being developed by Obsidian Entertainment, which is made up of many former Black Isle employees.

Fallout Series Wikipedia

This is a very helpful page in terms of looking at the whole series. I actually have yet to find a page that looks at the series as a whole. If you scroll down the page a little, you can also find a timeline displaying when each game of the series game out, which I find incredibly helpful.

Fallout Series Wikipedia