For me, it’s CAD software. FreeCAD is trash (sorry, lovers). Fusion360 is honestly the best out there for free. The “almost there” app is Shapr3D, but fuck $40/m.
And yes I’ve tried all the others not listed here.
Excel. There are other options, sure, but excel is really hard to beat.
Email. Gmail really does it well. However, I have switched mostly to Proton, so maybe that’ll stick.
Email
Wdym? There are lots of providers, I think the competition isn’t lacking.