APM, (Application Performance Management) tool
Database connection pool written in Java
The Java agent for Apache SkyWalking
LIXA, LIbre XA, is a free and open source XA transaction manager
Run programs faster anywhere
Enterprise-class, distributed monitoring solution for networks & apps
Database monitoring agent for zabbix
An open source search engine with RESTFul API and crawlers
The Simplest Multi-User Latency Monitoring Web App
Monitoring of websites with spider and email notifications
ss7mon an SS7/SIGTRAN signalling monitor
Database Replication Benchmark and Test Tool
AlertOnFailure was inspired by XYmon, a Big Brother Compatible Monitor