A collection of Roblox Studio plugins you may find useful in day-to-day use

BUILDER'S TOOLKIT

By far the most useful plugin on this list, Live Mirror allows you to duplicate whatever parts you have selected into the exact opposite position. Think of it as the Mirror tool in an art program, but for 3D space. (because that's what it is. and it's FUCKING AWESOME)

Archimedes, as described by the plugin itself, allows you to create circles and arcs by spawning in a bunch of parts originating from the one you have selected. The plugin allows you to tweak the angle of the parts you insert as well as change what side of the origin part they spawn on. I haven't really used it THAT much, but it is still very useful for whenever I do need it.

Camera Locker is an extremely simple one-and-done plugin that lets you use in-world parts as positions for the Roblox Studio camera. This one is really only useful if you plan on using Studio to do renders/scene builds/whatever you wanna call them (which, I do. you can probably find one in my portfolio) but otherwise, feel free to skip this one
if you DO make renders though, get this one!!!!!!!!!!

I might add more in the future!