UppercaseCommands is a super simple but effective plugin for Minecraft servers running on Bukkit or Spigot platforms (meaning everything from Spigot to Purpur is supported). It automatically converts the second character of any player command to lowercase if it is uppercase. This ensures that the hated "Unknown Command" will not be thrown when you hold Shift a little too long.
For example, if a player types `/Help`, the plugin will correct it to `/help`.