NATS vs Pushpin: What are the differences?
NATS: Lightweight publish-subscribe & distributed queueing messaging system. Unlike traditional enterprise messaging systems, NATS has an always-on dial tone that does whatever it takes to remain available. This forms a great base for building modern, reliable, and scalable cloud and distributed systems; Pushpin: Reverse proxy for realtime web services. Pushpin is a reverse proxy server that makes it easy to build realtime web services. The project is unique among realtime push solutions in that it is designed to address the needs of API creators.
NATS and Pushpin belong to "Realtime Backend / API" category of the tech stack.
Pushpin is an open source tool with 2.53K GitHub stars and 96 GitHub forks. Here's a link to Pushpin's open source repository on GitHub.