Polk4.net: Canvas test-net, explorer and transfer endpoint.
DotView: Chrome extension for an easy watch-only account storage with balances:
Currently I'm working on a very ambitious project which is going to be a financial hub for Polkadot on mobile devices. I'm not sponsored by WEB3 foundation or any organisations and building software as a hobby.
And we've done that with my friend Ilya:
(GooglePlay publishing is in review, but enjoy this 4K demo)
Also with Ilya we built a meetup Android application just before COVID :)