MockingBoard is mine, and it's live: 192 registered users and 7 on Pro. It's a platform for people who treat the NFL Draft as a year-round craft, built around scouting workflows and without the ads and gambling most of that space runs on.
The best part is the Discord bot. It runs a full mock draft natively inside a Discord server — up to all 32 teams, some controlled by friends and the rest by CPU, with quick-pick buttons, position filters, a pick timer, and trades priced off the Rich Hill trade-value chart. Nobody leaves the chat, and draft history saves back to Firestore.
Under it is a TypeScript monorepo: a Next.js web app and the bot sharing one core package, on Firestore and Firebase Auth, deployed to Cloud Run. It's in active development; the next move is fantasy football.