I think there are various lists that we have made for useful software, but if we can compile it in this thread I will sticky it.
Hex editing: xvi32
http://www.chmaas.handshake.de/delphi/freeware/xvi32/xvi32.htm
Hex Comparison of two files:
http://www.deepcoldsoft.com/diff/download.html
notepad++
http://notepad-plus-plus.org/
Macintosh compatible programs:
Photoshop
http://www.photoshop.com/
Hex Edit
http://hexedit.en.softonic.com/mac
Gimp
http://www.gimp.org/
http://www.xnview.com/ XnView
http://www.unwrap3d.com/u3d/index.aspxUltimate Unwrap 3D Pro Demo
7zip
http://www.7-zip.org/
Macintosh compatible programs:
Photoshop
http://www.photoshop.com/
Hex Edit
http://hexedit.en.softonic.com/mac
Gimp
http://www.gimp.org/
http://www.xnview.com/ (http://www.xnview.com/) XnView
http://www.unwrap3d.com/u3d/index.aspx (http://www.unwrap3d.com/u3d/index.aspx)Ultimate Unwrap 3D Pro Demo
I Think this could be put as its own post but I think I'll just leave it here unless someone thinks otherwise.
For SWBF1 Modders:
SWBF1 Mod Tools (http://www.swbfgamers.com/index.php?action=downloads;sa=view;down=452)
SWBF2 Mod Tools For SWBF1 (http://www.swbfgamers.com/index.php?action=downloads;sa=view;down=541)
.MSH Viewer (http://www.gamefront.com/files/service/thankyou?id=15627929)
BFBuilder Pro (http://secretsociety.com/forum/downloads/BF1/BFBuilderProWIP030605.zip)
Best Of PC Fix (http://www.gametoast.com/forums/viewtopic.php?p=289858#p289858)
ZeroEditor Update (http://secretsociety.com/forum/downloads/BF1/ZeroeditorUpdate012705.zip)
Boundaries Fix (http://secretsociety.com/forum/downloads/BF1/Boundaries_fix.zip)