Perfect Select is a Blender add-on that extends the standard selection tool(at the moment just for mesh). This is a part of rewriting "perfect shape" addon for blender 2.83+ which will now be a toolset of 2-3 separated but compatible addons.

Demo video: https://youtu.be/TCUGzs8SA_8

• selection snapping (with sliding on edge)
• extending selection to boundary loops
• preselections
• instant mirroring for select / deselect
• selection pattern from objects and images

• optimization
• extension to other editors (eg. UV Editor)