- Spring Loggy and ZK-Lobby are lobbies, that is, applications to find player and launch multiplayer games.
- rapid-gui is a way to distribute Spring related files such as game and maps. A bit like a torrent client or an updater.
- Test Spring is just a shortcut to run the bare spring engine directly.
So none of what you listed is an editor.
There isn't one single unified Spring editor. Modding Spring is essentially done with application that weren't made for Spring in the first place, and a few extra tools.
You need:
- A text editor, such as Notepad++
- A 3D modeller, such as Wings3D or Blender
- An image editor, such as Gimp or Photoshop
There are a few Spring specific application, though:
- mapconv, which is used to compile a serie of images into a Spring Map.
- UpSpring, which was used to convert a 3D model into Spring format (but this step isn't necessary any more).
Then some people also have developped ingame tools, to help create map, unit animation, or other tasks.
I suggest you look around in the
Spring Wiki and
many Spring subforums for links and tutorials. Yes, some information will be messy, outdated, or contradictory, but overall, there should be enough forum threads and wiki pages to cover everything, several times.
If you want help, try to be define more precisely what domain you're interested in.
For exemple:
- How to create a map?
- How to make a 3D model for a unit?
- How to change the stat of a unit?
Instead of a broad "how to edit Spring".