Conditional consonant changes
Anthologica Universe Atlas / Reference / Sound Changes / Conditional consonant changes

Ø → ŋ / #_V (some Austronesian and Samoyedic — Nganasan?)
w j → p / _# (Levei)
t ndr → kʰ / #_ in nouns (Drehet; this is the only aspirated consonant)
w b → c / #_, → nc / V_V (Sundanese)
b ʀ → k(k) / V_V (Berawan; ʀ may have been alveolar)
P[+voice] → P[-voice] / N_ (Murik)
Ø → j → l / #_ (Motu)
bʰ dʰ ɟʰ > s (Kiput)
w > j / #_ (Hebrew)
w > j / C_ (Cheyenne — cf. unconditional w > j in Arapaho)