asciiflow - Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.
ServerSuit - ServerSuit is a browser based program that enables remote Linux administration, monitoring, website hosting, and server setup automation.
PabloDraw - PabloDraw is an Ansi/Ascii text and RIPscrip vector graphic art editor/viewer with multi-user capabilities.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
JavE - JavE (Java Ascii Versatile Editor) is a free Ascii Editor.
RedGate SQL Monitor - SQL Monitor helps you and your team find issues – before they become problems