This is a collection of tools that I personally use when modelling.
Tools Panel
Multi edit UV select
Selects chosen index across all selected meshes. It's really convenient when you're UV editing several meshes with multiple UV channels because it allows you to quickly make sure that every object is currently using correct active UV channel
Reference collection tool
Allows you to bind to the shortcut array of collections to toggle visibility on and off, really useful for collections containing some sort of reference objects which you might need turn on and off constantly for measurements and so on
Material Manager
Material reassign tool
Material reassign tool allows you quickly reassign one material onto another across the whole scene and optionally delete original material from the scene.
Material list
Allows you to purge unused materials, force delete any material (regardless if it's used or not) from the scene.
Select material allows you to quickly locate objects that use particular material.
Assign in object mode assigns material to an object, in edit mode it creates additional material slot for selected faces and assigns material to the new slot if necessary.
Cleanup procedures
Contains helper functions to cleanup geometry such as batch UV renaming, previewing all UV set names in the entire scene and a bunch of other useful functions
Object mode
Provides a lot of useful shortcuts like
Add Bevel Mod - adds bevel modifier with predefined settings for optimal use by hardsurface artists
Add Vertex Normals Mod - adds Weighted Vertex Normals modifier with predefined settings like Weight 100, face influence on and enabling auto smooth if it's not active
Triangulate selected - gives an ability to add triangulate modifier before export to all or selected objects while preserving vertex normals
Hidden Objects To Collection - places all currently hidden objects in a new collection called HiddenObjects which is useful when you have a lot of helper objects hidden during your work and you want to quickly place them in one spot
Collapse Linked Collection - collapses linked collection to regular objects and cleanup unnecessary empties along the way
Add Parent Empty - adds empty and sets it to the parent for selected object
Vertex Color Fill Black - creates (if necessary) vertex color channel and fill it with black color
Edit mode
Set Face Weights - quickly set face weights to selected faces (for Weighted Normals modifier)
This tool is publicly available at Gitlab and is being sold at blendermarket