EmailEngine is a self-hosted email API. It connects to any email account over IMAP/SMTP, the Gmail API or Microsoft Graph and exposes all of them through one REST API, with real-time webhooks for new, changed and deleted messages, bounces and sent mail. Developers use it to sync their users' mailboxes into their own product and send email on the users' behalf, without writing IMAP, MIME or OAuth2 code themselves. Built by Postal Systems, the team behind Nodemailer.

coldcaller.pro is a French B2B prospecting SaaS selling qualified cold-calling leads to solopreneurs and agencies. Leads come enriched with the owner's direct mobile + email. Subscriptions €19–99/mo, no free trial, ~9% visitor-to-paid conversion, €2.4k MRR with minimal fixed costs (93% margin). 100% community driven acquisition (word of mouth). Runs solo — big upside with paid ads or a sales team.

AI-Powered Chrome extension in education space, providing answers in browser covertly.

Open source AI clip generator. Paste a long video (podcast, webinar, stream, interview) and get vertical 9:16 clips for TikTok, Reels and Shorts, with auto-reframing, subtitles, hooks, AI dubbing and direct publishing. MIT-licensed and self-hostable (5.7K GitHub stars), plus a hosted Cloud version with a free plan (20 min/month, no card) and paid plans from $12/month.