Apache OpenWhisk vs Cloud Functions for Firebase: What are the differences?
Apache OpenWhisk: A serverless, open-source cloud platform. Apache OpenWhisk (incubating) is a serverless, open source cloud platform that executes functions in response to events at any scale; 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.
Apache OpenWhisk and Cloud Functions for Firebase can be primarily classified as "Serverless / Task Processing" tools.
Apache OpenWhisk is an open source tool with 4.1K GitHub stars and 792 GitHub forks. Here's a link to Apache OpenWhisk's open source repository on GitHub.