What are your favorite open source 3D printers?

Resin and filament, bonus points for laser sintering or anything else.

EDIT: Thanks to all the commenters, especially fanalarbiter, here's the best list we have so far:

FDM:

• Voron
• RatRig V-core
• the 100
• Micron by Printers for Ants
• Powerbelt3D

Resin:

• Prometheus MSLA
• Lite3DP

ArmoredTurtle

SLS:

• SLS4ALL

Powder bed fusion metal 3d printers: reAM250