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4 ideas
Province-specific real-estate licensing drill app for BC, ON, AB — 5,000+ practice Qs, flashcard + exam-sim mode, offline.
Drop-in Flutter SDK + desktop tool that ingests messy PDF/CSV question banks and emits FSRS-ready structured decks, with Claude-powered cleanup, runs offline.
A drop-in Next.js middleware that lets any SaaS accept USDC on Base/Polygon/Arbitrum with subscriptions, webhooks, and a hosted checkout — no Stripe required.
TypeScript SDK that wraps Helius/Triton RPCs and the Metaplex/Anchor IDLs to give a viem-style read API for Solana: typed getAccount, getProgramAccounts with memcmp filters, and event subscriptions via WebSocket.