On-canvas alignment guides aka "smart guides" are more or less functional in one of Inkscape's GSoC git repos.
I did not expect something so usable to be available in this year's GSoC projects this early. But hey, you live and learn! :) Parth Pant who made this possible is a real hero.
Server run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!