I use FreePCB and TinyCAD. Its gonna be hard to beat free.
Also for our Corporate usage, it would have to have a ‘private’ area for designs that are intended to make $$$. Also it should be able to export gerbers that I can send to anyone.
Shared libs would be your biggest leverage, I would hate to have to port all my parts and footprints to eagle even. I would suggest you also import tinycad and freepcb files/libs.