Cacti vs Munin: What are the differences?
Cacti: Cacti stores all of the necessary information to create graphs and populate them with data in a MySQL database. Cacti is a complete network graphing solution designed to harness the power of RRDTool's data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box; Munin: PnP networked resource monitoring tool that can help to answer the what just happened to kill our performance. Munin is a networked resource monitoring tool that can help analyze resource trends and "what just happened to kill our performance?" problems. It is designed to be very plug and play. A default installation provides a lot of graphs with almost no work.
Cacti and Munin can be primarily classified as "Monitoring" tools.
Munin is an open source tool with 1.31K GitHub stars and 383 GitHub forks. Here's a link to Munin's open source repository on GitHub.
Redsmin, Index.co, and VuMedi are some of the popular companies that use Munin, whereas Cacti is used by Webedia, Cosmote, and Dek-D. Munin has a broader approval, being mentioned in 15 company stacks & 3 developers stacks; compared to Cacti, which is listed in 5 company stacks and 5 developer stacks.