This is Tunse'al Quick Starts and Side Tracks, Systemless. While it is not a "quick start rules" product, it can be used in a similar fashion if you just want an idea of what Tunse'al is without first buying the Tunse'al Setting Guide. All Tunse'al products are made in a second, systemless version, too.
Tunse'al Quick Starts and Side Tracks is best used with the Tunse'al Setting Guide and whatever system's rules you prefer as it's intended as a GM aid.
This PDF contains:
an encapsulated view of the world
six Quick Starts scenarios to help you get quickly started in creating your own Tunse’al campaign; most are designed with low level or somewhat inexperienced characters in mind, which is easily altered to your needs
ten Side Tracks meant to give you something to pull out quickly when you need to fill in gaps, stretch out a session, or even just for use as an adventure seed to improvise from