Larry Niven's Ringworld series has multiple forms of FTL travel.
The Hyperspace Shunt:
The hyperspace shunt, an engine for faster-than-light travel, but slow enough (1 light-year per 3 days, ~122c) to keep the galaxy vast and unknown
The Quantum II Hyperspace Shunt
the new "quantum II hyperspace shunt", developed by the Puppeteers but not yet released to humans, can cross a light-year in just 1.25 minutes (~421,000c).
Though one could argue that if they are both "Hyperspace Shunts" that this isn't two different forms of FTL.