This list is my personal top 10 list of PHP projects that have no financial backup or support which deserves credits. I've also included my motivation as reference.
- Composer: It revolutionised PHP world by allowing people to build awesome components supported by major frameworks and tools
- PHPUnit: Since it was ported to PHP it added quality and easy maintenance to a lot of projects
- XDebug: This tool has offered developers a chance to analyse their code step by step to find bugs or solve coding mysteries
- Slim Framework: A true PHP microframework
- Phing: The PHP build tool
- MantisBT: The PHP bug tracker
- PHPDocumentor: The code analysis tool that turns your code blocks into software documentation
- PHP_CodeSniffer: The coding standards tool
- PHPWomen: The all-inclusive, welcoming community for PHP developers
- PHPMentoring.org: A platform for developers to learn from other developers skills they miss
As you have given credit to composer and phpunit , the underlying things they use are some of the symfony components. So it do deserve some credits.
I have not used phing and mantis and not that much phpdocumentator.
And adding adminer, auraphp, apigen
guzzle ( probably you will say it is backed by amazon. But in the early life it seems not ) to the list.