PostHog provides open-source web & product analytics
Open Source Security Analytics
A PHP search engine for your website and web analytics tool. GNU GPL3
Monitor Java applications - SQL, HTTP, Methods, Exceptions and more.
eAnalytics is an open source webanalytics tool
A checker (site and tool) for CVE-2014-0160
Cents Changes Proyect
Advanced web counter from the 2000's - not actively developed.
Privacy-friendly Google Analytics alternative