PublicAPIs - Explore the largest API directory in the galaxy
Outbound Apps by Intercom - Embed apps right inside your messages
API List - A collective list of APIs. Build something.
Semrush App Center - Power your marketing by connecting your apps to Semrush data
API for Product Managers - The A to Z of APIs for product managers
Hotline - In-app chat,real-time engagement & self-service for your app