Zenbership Membership Software: Achieve Membership Nirvana
Laravel Software Install Script Template - Most especially awesome for Open Source Projects
Fat-free forum software.
Backend library for SlickBoard - An open source forum software.
NEM Blockchain NIS API Wrapper and Software Development Kit for PHP
The once to be board software for Ylilauta. Might not always be open source.
A Wix App, RSS Feed, demonstrating how to build a production ready app. Client & Server from scratch using PHP server & Wix client side libraries.
Luna is an easy and beautiful solution to build your own board.