BasisZock

VeloSend is an easy-to-use plugin that lets you send players to other servers via simple console or in-game commands and is Open-source.

An Open-source Minecraft plugin to send players to other velocity servers with signs. Made by BasisZock

A simple Open-source Paper/Spigot plugin that scans all YAML configuration files in the plugins folder and reports syntax errors. Useful for debugging misconfigured plugin files.

SpeedTracks lets you control minecart speed by changing the block beneath the rail. Set precise speed multipliers, like 2.0 for double speed or 0.5 for half speed, for any block directly in the configuration file and is Open-source.