OPEN SOURCE TOOLS
Here is a list of open source tools that we use to create a streamlined test process for our clients.
Test-link
Test-link is most widely used web based open source test management tool. It synchronizes both requirements specification and test specification together. It supports both automated and manual execution of Test cases.

Bugzilla
Bugzilla is a bug- or issue-tracking system. Bug-tracking systems allow individual or groups of developers effectively to keep track of outstanding problems with their product.

Mantis Bug Tracker (MantisBT)
MantisBT is an open source issue tracker that provides a delicate balance between simplicity and power. Users are able to get started in minutes and start managing their projects while collaborating with their teammates and clients effectively

ownCloud
ownCloud is a file server that enables secure storage, collaboration and sharing. ownCloud helps users regain their digital sovereignty. It provides lots of convenient features, too, but also stores files securly and efficiently. There are no backdoors, you can check, it’s open source.

JMeter
The Apache JMeter is a pure Java open source software, designed to load test functional behavior and measure performance. It is used to analyze and measure the performance of web application or a variety of services. Nowadays, it is used for a functional test, database server test etc.