Wetty - Terminal over HTTP and HTTPS.
ServerSuit - ServerSuit is a browser based program that enables remote Linux administration, monitoring, website hosting, and server setup automation.
Bastillion - Bastillion is an open-source web-based SSH console that centrally manages administrative access to systems.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
SSHy - SSHy is a HTML5 SSHv2 web client implementing E2E encryption that runs well on modern web browsers.
RedGate SQL Monitor - SQL Monitor helps you and your team find issues – before they become problems