An auctioning mod that uses diamonds as the currency [Forge (currently)]
Client Side Mod for seeing what a shop is selling on Fabric/Bukkit servers
Character Selector is an RPG style character picker for your world. It allows you to have multiple characters per world or server. [Fabric/NeoForge]
Server Browser is a mod that adds a server list in the multiplayer screen, if configured with a modpack, it lets you find a modded server to play on …
[Now On 1.21.1] [Fabric/Forge/NeoForge] An economy mod similar to what you'd find on a bukkit server