Here is a brief list I've collected! Make sure to post your own recommendations in too.
Unfortunately, I'm an Evil Villainess by lyharbour (Came back from a 40-day hiatus. Does that even count as hiatus?)
Godslayers by Trollmore (This one came off a 2-month Hiatus!)
System Error by based (Returns after three months! Slated to finish soon)
The Last Orellen by Sieley (You know this one already, right? A legend back after a year!)
I Became a [Biologist] in a Fantasy World! by Innate_Lymphoid_cell (Came back after 20 months, dropped one chapter, then went back on hiatus. Chad moves)
Getting Hard by _GD_ (Not recent, but still deserved. This one came off a six-year hiatus! Bow down to the grandmaster of hiatus enders!)
May every hiatus end someday!