Mosquitto vs Starling: What are the differences?

Mosquitto: An open source message broker that implements the MQTT protocol. It is lightweight and is suitable for use on all devices from low power single board computers to full servers.. The MQTT protocol provides a lightweight method of carrying out messaging using a publish/subscribe model. This makes it suitable for Internet of Things messaging such as with low power sensors or mobile devices such as phones, embedded computers or microcontrollers; Starling: A light weight server for reliable distributed message passing. Starling is a powerful but simple messaging server that enables reliable distributed queuing with an absolutely minimal overhead. It speaks the MemCache protocol for maximum cross-platform compatibility. Any language that speaks MemCache can take advantage of Starling's queue facilities.

Mosquitto and Starling belong to "Message Queue" category of the tech stack.

Starling is an open source tool with 468 GitHub stars and 63 GitHub forks. Here's a link to Starling's open source repository on GitHub.