The Torch of Fair Play and Bonfire of Equality and Democracy
Patch 1.04 Updates your game client to version 1.04. If you're getting the errors "recursive error after: User Interface is version 7, expected 6" or "server uses protocol version 16," this patch will fix it for you. If the patch is unsuccessful, try placing the file in your JK2 directory before running it.
JK2 Minimizer A Software to minimize jk2 easily, can make you switch between game and any other thing very fast.
Pakscape A Software to compile files into a zip or rar or pk3 compressed file. Also, you can edit archives with it. ( when you name the file you are compressing, don't forget to put extensions at the end : ex : Myarchive.pk3 and not Myarchive only )
Gimp 2.6 An image editor, equal to photoshop but free. Can manage all type of pictures.