Dev Tools

Postman – API Platform – develop and test APIs
soapUI – Web Service Testing tool
Eclipse – IDE mostly used for Java development, but can be used with most programming languages
Subclipse – Eclipse Plugin: Subversion
EGit – Eclipse plugin: Git
EclEmma – Eclipse plugin: Code coverage tool

Server Tools

Jenkins – Continous integration server
Sonar – Code quality analysis

Android Dev

Android Studio

Chrome Tools

Built with – Find out what the website you are visiting is built with using this extension.
Tampermonkey – The world’s most popular userscript manager.

Firefox Tools

Firebug – Firefox add-on: Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page…
MeasureIt – Firefox add-on: Measure elements on web pages in pixels
Pixel Perfect – Firebug extension: Overlay an image over the developed web page
Greasemonkey – Firefox add-on: Modify the layout or behaviour of any web page
DNS Flusher – Firefox add-on: Reload changes in the host file. Also shows the IP address of the web site.