Here are my currently active ones (verified):

• Sprint by Default, Hold to Walk: simply useful.
• Closer Promotion Terminal: adds a promotion terminal in your room.
• Death Marker: hovering hologram over downed dwarves. Useful to prioritize a class based on the situation.
• SimpleQOL: default hazard level and nice sorted list of missions. Waiting for some features but still good.
• Advanced Darkess: not sure about this one, solves a few glitches for me, but makes the caves a bit too dark.
• Ammo Percentage Indicator Extended: useful to avoid wasting resupplies.
• Silent Born Ready: removes those voicelines.

For those times we are too many I host with More Players Balanced, which however is only approved.