FreeDi
Link to the official source: https://github.com/Phil1988/FreeDi
Phil1988 On Reddit: https://www.reddit.com/user/C0co_33/
Post on Reddit announcing project release: https://www.reddit.com/r/QidiTech3D/comments/1i9i2zf/xsmart_3_eol/
Details / Screenshots From release 1.40
Note: Spoolman was added after the fact as was Crowsnest (using instructions from their wiki)