Alternative rulesets for Shadowrun: Anarchy
Catalyst themselves have had a pass at the idea of a less crunchy Shadowrun, in the form of Shadowrun: Anarchy. As a system it has good bones but is criminally underbaked in lots of different ways. You’ll likely quickly find yourself looking for more houserules to bolt on. If so, start by taking a look at Surprise Threat!, which has lots and lots of thoughtful suggestions.
(The world would be a better place if the author of Surprise Threat! was given free reign to write Anarchy 2e, but we are where we are.)