I was just talking with a friend about the tools I use for modding. Spreadsheets, spreadsheets, spreadsheets.
What does everyone use for their mods as far as organization, content generation and so on?
Ever since I started modding back-forever-ago, I would make giant spreadsheets with computed values so I could attempt some sort of balance, or at least sort values and get a larger overview of things. Final Fantasy, Ultima V, Final Fantasy Tactics, Jagged Alliance, Vampire: Bloodlines, BBS door games, NES editing, Snes save game hacking, Wasteland 1 and 2, XCom (2012), Xenonauts and some others I can't recall now: All my mods start from a spreadsheet.
Right now I'm using:
Notepad++ for text editing. I used to use something else, but I can no longer recall what it was. I have a textfile for soldier editing that goes back to 1998 and most of my text is typed up on base text editors. Not much to brag about because I'm sure there's someone who uses VI on here to text edit (there's always one), but just more an observation.
Aseprite for sprite editing: I finally listened to everyone on here. It handles gif palettes without crapping all over everything, which is amazing. I still do a little work in GIMP from time to time as needed, but everything gets final processing in Aseprite.
Visual Studio 2013 for coding with resharper, codemaid and github. I use vs2013 with tfs at work daily so using a IDE that's familiar to me is handy. Better than struggling to get ECLIPSE up and working and coaxing Cmake to do what you want to do, which can be a massive pain in the ass. I wish I was better at C++ instead of using easy mode C++ called C# all day (AKA: C++++).
WindHex32 I do a lot of hex editing (but none so far for OpenXcom) for most games, especially ones that aren't supposed to be modded. I used to use 'Thingy' and a few other programs, but WindHex32 is the only one I can get to work reliably.
Google Docs (spreadsheets) for mod planning. This used to be/still-sometimes-is Excel, depending on what I am working on, but it all gets imported to google now so I can access it anywhere. Here's where I do all my sorting of values, comparing, contrasting and generating 'computed' values so i can attempt to give some sort of balance to my mods.
Wikipedia and google via firefox for generalize research.
I'd love to hear what everyone else uses.