If you're looking for a comparable tool that's AWS-focused, CloudSploit [1] is a also open source and has a similar "collect and analyze" architecture (full disclosure: I'm a co-founder of the SaaS product). We've also started adding Azure [2] recently as well, but it's not at the same level as our AWS scans yet.

[1] https://github.com/cloudsploit/scans/tree/master/plugins/aws

[2] https://github.com/cloudsploit/scans/tree/master/plugins/azu...