Cloud Functions for Firebase vs FaaS: What are the differences?
Cloud Functions for Firebase: Run your mobile backend code without managing servers. Cloud Functions for Firebase lets you create functions that are triggered by Firebase products, such as changes to data in the Realtime Database, uploads to Cloud Storage, new user sign ups via Authentication, and conversion events in Analytics; FaaS: Functions as a Service (on Docker Swarm). FaaS is a platform for building serverless functions on Docker Swarm Mode with first class metrics. Any UNIX process can be packaged as a function in FaaS enabling you to consume a range of web events without repetitive boiler-plate coding.
Cloud Functions for Firebase and FaaS can be primarily classified as "Serverless / Task Processing" tools.
FaaS is an open source tool with 14.8K GitHub stars and 1.17K GitHub forks. Here's a link to FaaS's open source repository on GitHub.