well here is some i use besides of most of addons already mentioned that i also use:
meshmachine: for undoing bevels/chamfers, cleanup booleans, offset loops and unf*cking loops, transferring normals and more…
boxcutter/hardops: for easier and faster management of modifiers and with some extra mesh/object mode tools such as edit multi tool and more, and booleans created in the fly with no fuss usually in a intuitive way to make cutters and more features…
machinetools deus ex: an special paid version of machine tools (free) with two extra tools one called punch it (a manifold extruder that works) and edge constrained tranform (basically a combination of rotation and edge slide at the same time)
this new addon for faster vertex path connect https://bookyakuno.gumroad.com/l/mesh-thikuthiku
blackmesh: Black Mesh - Procedural Modeling Tool for concept and planning blockout and highpoly modelling with voxels with faster booleans (yeah way more faster and no fuss than using the modifiers such as remesh and booleans modifier that could but not really replace this addon) of an complex 3d design before retopology or anything else…
zaloopok https://github.com/TitusLVR/zaloopok some extra features for edge loop/ring selection and better loops straightening than looptools…
and many more xd