pg_activity is a top like application for PostgreSQL server activity
sp_whoisactive
The Corosync Cluster Engine
The Pi-hole FTL engine
NoSQL database that uses RocksDB as storage engine
Open-source distributed computation and storage platform
a pluggable app that runs a full check on the deployment
Visibility into servers, applications, and infrastructure
Identify sizes of memory modules installed on most UNIX-based systems
Benchmark CPU, GPU, memory, and storage
AIX, Linux, VMware, Nutanix, Oracle, RHV, Cloud performance monitoring
Multi-platform disk cataloguing utility written in java.
SpiceDB is the open source, Zanzibar-inspired authorization system
Postgres wire compatible SQLite proxy
Logging utility for DB2 for LUW written in SQL-PL
Active, high-performance open source database middleware
Breeze::OS Linux/BSD distribution
Super Nintendo (SNES) emulator focused on performance, features
DBLX3 Relational Database System
Small Database Management System
Real time monitoring for embedded devices
Raspberry Web Server OS Raspbian Stretch / 9