Scypter

Control the server's join, quit, kick, death and advancement messages. Keep vanilla, hide, or replace them with your own colored text and placeholders. Lightweight, no dependencies, one jar for 1.8.8–26.x on Spigot, Paper, Purpur and Folia.

Completely disables chat and blocks blacklisted commands. No permissions, no bypasses. Works on 1.8.8-26.3.

Maintenance mode plugin for Paper/Spigot (1.8.8+) and Velocity (3.x–4.x): kick or block players, per-server mode on Velocity, whitelist, timers, schedules and Discord alerts. Russian by default, English available.