Have you ever considered selling your development tools?

As a programmer, sometimes we make internal development tools to make our products possible. One thing that I'm starting to do this year is to sell some of the tools we make internally and begin to offer them to the market, mainly as APIs. Some tools eventually complement your main product MRR and can be used to support your projects. Some of the products that I'm planning on launching are: - Google Sheets API (already launched) - Screenshot API (already launched, but not on PH) - Cheap Transcription API (to be launched) - YouTube Data and Download API (to be launched) - YouTube Video Summarization API (to be launched) - Scene Detection API (to be launched) - Face Detection API (to be launched)