Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
LiteSpeed Web Server - LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement.
QUCS - Qucs, briefly for Quite Universal Circuit Simulator, is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit.