I use gimp for skins, and I am developing a texture pack with it. One you learn it, it is really useful.

You can also make texture packs on iOS apps.

You don't need 7-zip or winrar. But you will need one of them if you want to publish it.

Many programs can be used to make texture packs. Making one requires WinRAR or 7-zip. Using programs like Paint.net or Gimp can help. DO NOT make a texture pack with paint cause it would end up as a poor texture pack when it is finished. Here's a link to a video on how to make one:

http://www.youtube.com/watch?v=tqgzg8Y4Nuc

yes i will help.i recommend paint.net for making texture packs.