This is a project I've been working on for a while - a Multimeter suitable for everyday electronics use that is open source, modular, highly configurable, and relatively inexpensive.
Survey Link: forms.gle/8aRiu7bZfFKwXwhQA
I've called it Hydra Meter, after the ancient Greek Hydra - a monster that can not just survive being decapitated, but grows another head when it is. Not only can this meter continue to function with the display detached, many parts of it can be relatively easily replaced for upgrades, different versions, or additions. The end goal of this is to have a modular system to allow the frontend, ADC, user interface, and display to be freely interchanged, though that is still a ways off.
Github with all design files: github.com/jduffy105/HydraMeter_0.4
Hackaday.io page: hackaday.io/project/176607-hydrameter
This is still in an early state, much of the modularity isn't implemented and it isn't well characterized, but the basic functionality is there and the core features work.
Let me know what you think!
Credit to a few resources I've used and projects I drew from:
Looked through the schematics for this: github.com/MartinD-CZ/STM32F1-open-source-multimeter/tree/master and didn't really use anything directly, it's the only other project I could find in this area, so I may have informed some ideas.
This one is amazing: www.eevblog.com/forum/metrology/diy-6-digit-handheld-volohmmeter/ isn't quite the same kind of thing, but I will likely draw a lot of idea from this going forward.
This one isn't directly related but is far too adorable not to mention: hackaday.io/project/198892-sao-digital-multimeter
And this site: lygte-info.dk/info/DMMDesign%20UK.html
has been an incredible resource