ResourcePack Workbench Creator 1.8, 1.7.10, 1.7.2 (RPW) is a tool to make creation of Resource Packs easier.

Features:

• It is a java application, just like Minecraft, so it should run everywhere - Windows, Linux, Mac.
• It lets you easilly combine packs, create new ones, edit texts and images etc (with the help with external editors, or for texts, the built-in one).
• RPW comes with a Project system, so you can work on more packs at once, and keep them in separate folders.
• It was made on Linux and uses GIMP for editing the images, but you can change that in the config file.