As Terran
Make:
Hellion
Widow Mine
MarineWalls and splash force Lings into poor trades.
Open in the counter tool with Zergling tagged ->As Protoss
Make:
Adept
Zealot
ArchonWalling is part of the counter. Do not let Lings choose surface area.
Open in the counter tool with Zergling tagged ->As Zerg
Make:
Baneling
Queen
RoachBaneling control decides early Ling wars.
Open in the counter tool with Zergling tagged ->
Ravager
Hydralisk
Lurker
Mutalisk
Corruptor
Overlord
Overseer