Distance Field Editor (experimental)
https://blog.thrill-project.com/zwerg-distance-field-editor/
Feel free to fork and modify.
1.4.1 - 2020-11-30
1.4 - 2016-06-05
1.3 - 2014-06-15: external nodes.xml (contains all available nodes from scene view context menu), simplified internal tree structure and code cleanup, fixed: node order
1.2 - 2014-06-14: fixed mouse sensitivity issues
1.1 - 2014-06-10: mouse click selection of df objects + minor fixes