===List of useful tools and extensions:===
Database Management
1. ((http://www.adminer.org Adminer)) - Database management in a single PHP file
2. ((http://dev.mysql.com/downloads/workbench/ MySQL Workbench))
3. ((https://sourceforge.net/projects/sqleo/ SQLeo Visual Query Builder))
IDE
* ((http://www.eclipse.org/downloads/ Eclipse))
* ((http://www.netbeans.org/ NetBeans))
* ((https://www.jetbrains.com/phpstorm/ PhpStorm))
* Extensions
* ((https://www.sonarlint.org/ SonarLint))
Diff and merge
* ((http://meldmerge.org/ Meld))
* ((http://winmerge.org/ WinMerge))
Migration
* ((https://github.com/rectorphp/rector Rector)) - Instant Upgrades and Instant Refactoring of any PHP 5.3+ code
Graphics
* ((https://inkscape.org Inkscape))
* ((https://github.com/RazrFalcon/SVGCleaner SVGCleaner)) - optimize SVGs
* ((https://github.com/svg/svgo SVG Optimizer))
* ((https://squoosh.app Squoosh)) - image compression web app
* ((https://tinypng.com/ TinyPNG)) - smart WebP, PNG and JPEG compression
Firefox extensions
* ((https://developer.mozilla.org/en-US/docs/Tools Firefox Developer Tools))
* ((https://github.com/gorhill/uMatrix uMatrix))
* ((https://addons.mozilla.org/en-US/firefox/addon/livemarks/ Livemarks))
* ((https://addons.mozilla.org/de/firefox/addon/noscript/ NoScript))
* ((https://addons.mozilla.org/en-US/firefox/addon/laboratory-by-mozilla/ Laboratory (Content Security Policy / CSP Toolkit) ))
* ((https://addons.mozilla.org/en-US/firefox/addon/dictcc-translation/ Dict.cc Translation))
LAMP
* ((https://www.apachefriends.org XAMPP))
* ((https://www.mamp.info/en/mamp/ MAMP))
Mindmapping
* ((http://www.insilmaril.de/vym/ VYM))
* ((https://waf.io/semantik.html Semantik))
OS
* ((https://www.opensuse.org/ openSUSE))