Chrome extension by Amit Agarwal that let users subscribe to RSS feeds in Feedly from any web page with one click, with 30,000+ users. Sold in 2014 for a four-figure amount via PayPal; the anonymous buyer later turned it into adware.
Directory listing online tools accessible without signup, catering to users looking for hassle-free access.
Humorous LinkedIn post generator with a cringe meter built by Tom Orbach. After going viral and reaching 15 million people, it was acquired by LinkedIn growth tool Taplio in 2022 within a week of launch, for an undisclosed price.
A directory listing startups and their public earnings that grew to 470+ subscribers within 3 months as a side project; acquired via MicroAcquire by a buyer named Igor (price undisclosed).