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https://sentinel.oblivionzone.com/
The Graveyard of the Open Web
Every product we revived, when it died, and who it left behind.
Google Reader
2005 → killed July 1, 2013 · 8 years old
The web's universal RSS aggregator. 30 million+ active users at death. Google killed it citing "declining usage" while subscriber counts were still growing. RSS subscriptions have grown 34% per year since the murder. Feedly, Inoreader, NewsBlur exist but none replicate Google Reader's clean simplicity — and none use AI. SENTINEL Reader is what Google Reader would have become.
⚡ Yahoo Pipes
2007 → killed September 30, 2015 · 8 years old
The original visual no-code automation builder, before Zapier existed. 90,000+ active pipes at shutdown. Let anyone connect feeds, transform data, and build mashups in a browser. When Yahoo killed it the entire no-code-automation category died for 5 years. Zapier filled the gap but is closed-source and expensive. SENTINEL Pipes brings back open, visual, free workflow automation on n8n.
❓ Yahoo Answers
2005 → killed May 4, 2021 · 16 years old
The internet's biggest open Q&A platform. 200 million+ users. The Internet Archive preserved a 4.75 TB dump of every question and answer ever asked. When Yahoo pulled the plug, Quora became a paywall and Stack Exchange covers only narrow technical topics. The general open Q&A web is empty. SENTINEL Q&A is the AI-augmented replacement: ask anything, AI answers instantly, humans add expertise.
DMOZ / Open Directory Project
1998 → killed March 17, 2017 · 19 years old
The Open Directory Project. 5 million sites, 92,000 volunteer editors, 1 million categories. The largest human-edited web directory ever built — used by Google, Yahoo, AOL, Netscape, and every major search engine for 19 years to bootstrap their rankings. AOL silently killed it in 2017. The complete RDF dump still exists. SENTINEL Directory is rebuilt on top of DMOZ data with AI-powered category suggestions and modern moderation.
Yahoo Directory
1994 → killed December 31, 2014 · 20 years old
The original Yahoo. Before Yahoo was a portal, it was Jerry and David's hand-curated directory of websites — the very first navigation layer of the World Wide Web. By the time Marissa Mayer killed it, the directory cost $299 per submission. SEO professionals still mourn it: a Yahoo Directory listing carried more authority than any backlink today. SENTINEL Directory restores curated web discovery — free, AI-assisted, human-verified.
Delicious
2003 → murdered repeatedly until 2017 · 14 years of slow death
The original social bookmarking site. 5.3 million users at peak. Yahoo bought it in 2005, neglected it, sold it to AVOS in 2011, who sold it to Science Inc in 2014, who sold it to Pinboard in 2017 — Pinboard's sole purpose for the acquisition was to kill it. Pocket got Mozilla'd to death. Raindrop is closed-source. SENTINEL Bookmarks is open social bookmarking with AI tagging.
⬡ iGoogle
2005 → killed November 1, 2013 · 8 years old
Personalized homepage with widgets — weather, news, calendar, RSS, Gmail preview, stock tickers — all on one customizable dashboard. Tens of millions of daily users. Google killed it citing "modern apps" but no replacement ever delivered the same one-glance overview. Netvibes survives but feels frozen in 2010. SENTINEL Dashboard is iGoogle done right: every module on one screen, AI-prioritized.
Uptime Kuma — never killed, never hosted
2021 → present · open source, 62,000+ GitHub stars
The best open-source uptime monitor in the world. Self-hostable, beautiful, free. But nobody offers a hosted version. Pingdom charges $15/month, UptimeRobot's free tier is severely capped, StatusCake is enterprise-priced. There is a massive gap for "Uptime Kuma but you don't have to run a server." SENTINEL Monitor fills it.