Sit makes it possible to use slabs and stairs like chairs. Simply rightclick the top side of a right side up slab or stair block with an empty hand to sit on it. To exit, press the key you use to exit a minecart (by default SHIFT). Usually, slabs/stairs from other mods are supported.
This mod works on singleplayer as well as multiplayer, but needs to be installed on both sides if it's used on a server.
You are allowed to use this mod in any modpack.
Come join me on Discord! https://discord.gg/kgZUAxK
Follow me on Twitter for mod updates and other shenanigans! https://twitter.com/bl4ckscor3