Kodak's D-23

Water @ 125F
Elon
Sod. Sulfite
Water to make
750.0ml
7.5g
100.0g
1.0L
This has probably been the most utilized developer in the history of black and white photography ! It's simplicity and good all around working characteristics have endeared it to many fine art photographers.

BTW, if you are using TMX-100 or TMX-400 I strongly recommend this developer. It gives T-grained films the finest grain I've ever seen and keeps the highlights in check.

Development times for full strength at 70F are;

TMX -100 -- 9.5 min

TMY- 400 -- 8.0 min.

Development times for a 1:1 dilution at 70F are;

TMX -100 -- 14min.

TMY- 400 -- 12min.

Development times for a 1:3 dilution at 70F are;

TMX - 100 -- 21 min.

TMY - 400 -- 20min.