Games similar to Orebfuscator include PaperMC, which is free and open source. Other options are Purpur, OpenInv and Sakki's Client Essentials (SCE). In total there are four Minecraft Servers like Orebfuscator for Mac, Windows, Linux and self-hosting.
Paper is a fork of the Spigot server implementation (which is itself a fork of CraftBukkit). Paper strives to bring improved performance, more features, and more APIs for developers to build awesome plugins with.
Purpur is a Minecraft server fork of PaperMC that aims to provide high-performance Minecraft servers as a replacement for Paper and Tuinity.
Open anyone's inventory as a chest in real time! Works with offline players! Open ender chest of any player via command! Has read-only permissions for Moderators on your server you don't fully trust! (This is a Minecraft Bukkit Plugin.).
Canada
Sakki's Client Essentials are plugins for Minecraft Servers and Client's. It eliminates the problems with hacked client's and gives server administrators control by restricting clients to use whitelisted plugins and mods and ends unfairness.
