What are the usable tools?
I am aware of wxformbuilder and wxGlade, but none of them seems to be complete yet.
afaik... none. I'll follow the answers to see if someone has one and try it of course but I'm not convinced this will be THAT useful. When using wxPython, you usually work with sizers (at least I think the results are better) so you don't really need to "place" the controls on the frame and I think a GUI "design" would be longer to do. The only part where I think it could have some interest is to fill atributes for the controls but a good auto-complete with wx (or a good cheat sheet or a "template class" with all the options you use) solves the problem in my opinion. I stopped seeking for a GUI designer for wx after trying Pydev that auto-completes wx very nicely (a lot better than everything I tried before... and that's a lot!).
What are the existing open-source Python WxWidgets designers?