Second Brain OS
Second Brain OS is turns the whole subject into a map you can explore, and it's honestly brilliant.. It is ranked #116 on the AI Radar, in AI agents, first seen 29 days ago and shared in 5 posts (524.8k views).
What Second Brain OS says about itself
Guides and resources for AI engineers: a course on building agents, five handbooks, a hands-on second-brain project and a vetted reading list, all on one explorable graph.
Second Brain OS - guides and resources for AI engineers [[ second brain os ]] ≡ Contents / ☾ the whole site, as one graph Guides and resources for AI engineers A course on building agents from a single prompt to production, five handbooks that go deep on one layer each, a hands-on second-brain project, and the links worth your time. Free, plain markdown. Every page, term and tool on this site is a bubble. The lines are the real links between them. Click one to see what it leans on. drag orbit scroll zoom click open esc back made by @undefinedKi ← graph × ⟳ ⌂ [[ second brain os ]] drawing the map… This page draws the site as a 3D…
What people said about Second Brain OS on X
Lock yourself in just for 15 minutes and go through this site. I promise you'll know more about ai agents than 95% of people. https://secondbrainos.dev
— @undefinedKi, 2 days ago · 11.1k likes · see the post
If you want to really understand AI agents, spend some time on this new site. You won't regret it. http://secondbrainos.dev turns the whole subject into a map you can explore, and it's honestly brilliant. Every page, term and tool is a bubble. The lines show what depends on what, so you can actually see how the…
— @DataChaz, 2 days ago · 162 likes · see the post
Every AI engineer needs this. I spent months collecting everything I wish I had when I started building agents. Now it's free for everyone. Inside the repo: > A 7-module agents course, from zero to production > 5 deep handbooks > 114 vetted resources > 18 skills, 72 slash commands, 6 subagents and a Claude Code…
— @undefinedKi, 3 days ago · 82 likes · see the post
Alternatives to Second Brain OS
- Z.ai — chief scientist Jie Tang just revealed the training pipeline behind the upcoming GLM-5.5 (32B, 122B, and 256B) during…
- Firecrawl — @firecrawl - Give your AI agents web data and beyond
- dsh-superagent-prototype — DeepSeek open-sourced the design behind its always-on 'Super-agent': no chat window, and reportedly nearly half the…
- REA for Growth — 4,000+ data endpoints, one key.
- Muse — We've now paid out more than $1M in @muse bug bounties. That includes $300,000 to a security researcher who found the…
- Console by Nace.AI — Cloud Inference
Second Brain OS in numbers
- Rank on the AI Radar: #116 of 10392
- Shared in 5 posts by 2 accounts: @undefinedKi, @DataChaz
- 524.8k views on those posts
- First seen 29 days ago, last shared 2 days ago
- Pricing seen by AGK Intelligence: not stated
- Market: AI agents
FAQ
What is Second Brain OS?
turns the whole subject into a map you can explore, and it's honestly brilliant. It was first shared on X 29 days ago and is ranked #116 on the AI Radar.
Is Second Brain OS free?
Pricing is not stated on the page we read.
Who shared Second Brain OS?
2 accounts on X, including @undefinedKi, @DataChaz, in 5 posts totalling 524.8k views.
Every post is read and classified by AGK Intelligence: what it is, which market it belongs to, and whether the link is a real tool. 65.7k posts from 5k X accounts over the last 14 days, 10.4k tools, 19 markets. New posts are collected several times an hour and the full ranking is recomputed every hour — last update 2026-11-06 13:40 UTC. Full method.