open-data
Stack Exchange API Tool
The free, key-less API behind Stack Overflow and its sister sites, which will return exact question, answer and user counts for any date range -- useful for checking claims about the site's decline yourself.
OpenRouter Rankings Tool
Public leaderboard of which models are actually receiving token traffic, broken out by task category and time window. The clearest free read on real-world model adoption rather than benchmark scores.
Nemotron-ClimbMix Tool
NVIDIA's curated pretraining corpus, and the data behind this week's $998 from-scratch training run. A practical way to substitute somebody else's filtering work for compute you would otherwise spend on mediocre tokens.
HiFi-UMI-2K Tool
Released dataset behind this week's handheld-only robot training result: high-fidelity two-handed human demonstrations captured with a head-mounted stereo rig and tracked grippers, with every trajectory reconstructed and rejected unless a target robot could physically replay it. Covers wiping, shirt folding, remote insertion and produce sorting. Directly usable for imitation-learning experiments without owning a teleoperation setup.