reddit was the first to release anything online[0]. It's probably fair to say at that point, they were the most successful. I think it's arguable that reddit is still the most successful of those, though Loopt may have been acquired for more money. Here's what happened to the rest:
* Memamp - desktop search: failed to launch, remaining founder hired by reddit
* Infogami - something between a blog and a wiki: merged with reddit, became reddit wiki
* Firecrawl - security software: pivoted and became TextPayMe - mobile payments: acquihired by Amazon, merged in to Amazon Payments
* Loopt - mobile location sharing: acquired by Green Dot for $43.4 million
* Kiko - online calendar: launched shortly before Google Calendar, sold to Tucows for about $250k
* Clickfacts - advertising fraud detection: operated independently for years; now appears defunct
* Simmery - can't find anything on what this company was making: defunct
* Memamp - desktop search: failed to launch, remaining founder hired by reddit
* Infogami - something between a blog and a wiki: merged with reddit, became reddit wiki
* Firecrawl - security software: pivoted and became TextPayMe - mobile payments: acquihired by Amazon, merged in to Amazon Payments
* Loopt - mobile location sharing: acquired by Green Dot for $43.4 million
* Kiko - online calendar: launched shortly before Google Calendar, sold to Tucows for about $250k
* Clickfacts - advertising fraud detection: operated independently for years; now appears defunct
* Simmery - can't find anything on what this company was making: defunct
[0] https://groups.google.com/d/msg/comp.lang.lisp/vJmLVd9lJyk/1...