Mo' Bends replaces Minecraft's stiff character movement with lively animations. Players get animated sprinting, jumping, swimming, sword slashes, archery and ladder climbing; zombies, spiders (jump attacks, wall climbing) and skeletons move better too, plus sword and arrow trails.
It is a client-side mod for Forge, Minecraft 1.7.10 - 1.12.2, with plenty of configuration options.
Each player runs it locally, but if it belongs in the modpack for your Minecraft server, the panel adds it in one click.