Of all time, and my favorite series from each:
1. Nintendo - Zelda, Super Mario, Metroid, Kart, Punch Out!!
2. Capcom - Resident Evil, Street Fighter, Mega Man, arcade powerhouse
3. Konami - Castlevania, Contra, Metal Gear
4. Sega - Phantasy Star, Streets of Rage, Shinobi, arcade powerhouse
5. Rare - DKC trilogy, incredible N64 legacy