Simple OniSplit GUI (experimental AEI release)
Windows-only GUI for OniSplit.
Drag and Drop workflow to convert oni to xml and back to oni. Supports also various other file formats.
Level construction helper is still in the making.
At the moment it can set up a new level and quick-test it.
That includes consoles and turrets. Use right-click to select all parts. Then you can safely move and rotate them in XSI.