PocketMine-MP is a Minecraft: Bedrock Edition server software written in PHP, originally created by Shoghi Cervantes Pueyo, which can be enhanced and customised via plugins. Since the development on the main repository has stopped, the repository was forked and is currently maintained by members of pmmp.
PocketMine-MP plugin implementing instabreak anti-cheat which was originally built-in
Demo plugin showing how to add missing vanilla (not custom) blocks to PM5
Demo plugin showing how to manage plugin player data at runtime (without custom Player classes)