All the software that is being used in the remake. What compilers, Editors, 3D model editors, tools that help you extract certain files from the actual game, things like that. I'm also wondering if the whole source code will be released. I'm becoming more interested in the project now, and so I need to know how the whole game is being hacked up and put back together. I know this is probably a topic for the private forum, but it doesn't hurt to ask.
Erm..
Compilers: Well ... Delphi
Editors: Sorry? Editors, meaning what?
3d model editors: Well, so far we're just using the original FF7 models, so no new 3d models. That's more Seph3d's department than mine, though...
Tools: LGP Tools, Cosmo, FFLZS ... y'know, all the stuff off my website
Source code: Staying private for the moment. Doesn't mean I'll never release it, of course.
Backgrounds: At the moment the engine can read the existing FF7 backgrounds (in fact, finished most of the coding for that only recently), but it's perfectly capable of reading new graphics as well. It's up to the team how many totally new locations they want to create.