You can find another one for P2SH (starting with 3..) here: https://github.com/kristapsk/segvan.
And one for bech32 (starting with bc1..) here: https://github.com/tomatpasser/bech32-vanitygen-helper.

Nullius made one here: https://bitcointalk.org/index.php?topic=2934774.0
Supports both nested segwit and native segwit (Bech32)