I came across BlockStack(https://blockstack.io) in June 2019 as part of the first "Can't Be Evil" hackathon.
I built BlockSurvey - https://blocksurvey.io as part of the hackathon and today it has more than 1000+ users. It allows users to create surveys, polls, & forms with complete confidentiality. Rewards from App Mining helped to build further and I have bootstrapped the product completely from that money.
In this article, I would like to share the Top 10 DApps (BlockSurvey not included) which I like to bring to your attention so that you can try them too. This will also give you an idea of what is possible to be built with Blockstack and how you can bootstrap your product in a quicker time.
Envelop - https://envelop.app/ - Share private files easily, without losing their ownership. An alternative to WeTransfer / Firefox Send.
Compress.Studio - https://compress.studio - Serverless Image Compression Tool. An alternative to TinyPng / other image compression tools.
Mumble - https://app.trymumble.com/ - Text and voice chat for passionate communities. An alternative to Slack.
DCasso - https://dcasso.app - A decentralized drawing app. Ready, Set, Sketch!A fun drawing app.
Dappity - https://dappity.app/ - All your Dapps in one place
Paras - https://paras.id/ - Your Decentralized Personal Website. An alternative to about.me.
Note Riot - https://note.riot.ai - Easy to use note taking app. An alternative to Google Keep, Evernote.
Sigle - https://app.sigle.io - Decentralized blogging platform. An alternative to Medium or any blogging platforms out there.
Arcane Products - https://products.arcane.ac/ - Suite of office and dev tools. An alternative to GSuite in the making.
Daily Habits - https://thedailyhabits.com/ - Your private habit tracker.