This is a personal collection of dice roll tables, in combinations that come up frequently enough that I want notes of them. Some may be changed or added to over time.

2D6 (36 combinations, 11 values)

value frequency cumulative
2 1 1
3 2 3
4 3 6
5 4 10
6 5 15
7 6 21
8 5 26
9 4 30
10 3 33
11 2 35
12 1 36

3D6 (216 combinations, 16 values)

value frequency cumulative
3 1 1
4 3 4
5 6 10
6 10 20
7 15 35
8 21 56
9 25 81
10 27 108
11 27 135
12 25 160
13 21 181
14 15 196
15 10 206
16 6 212
17 3 215
18 1 216

4D6 keep 3 (1296 combinations, 16 values)

value frequency cumulative
3 1 1
4 4 5
5 10 15
6 21? 46?
7 38? 84?
8 62? 146?
9 91? 237?
10 122? 359?
11 148? 507?
12 167? 674?
13 172? 846?
14 160? 1006?
15 131? 1137?
16 94? 1231?
17 54 1285
18 21 1296