CaliVibe – Explore California Neighbourhoods
California neighborhood map with crime and population layers, but AreaVibes already does this better.

Tracks student cohorts over time instead of cross-sectional grade snapshots.
California parents, educators, school administrators
CAASPP Official Site · EdData.org
This second thing is important because if you, say, look at 'grade 5' performance over time, each year you're looking at a different mix of students, and the mix likely has as much impact as changes in instruction or whatever.
So I downloaded the 'research files' and made the tool I wished existed.
Example looking at grade level performance over time, one chart per grade: https://tools.encona.com/caaspp-explorer#e=district_75390&s=...
An example of looking at each cohort separately, one chart per cohort: https://tools.encona.com/caaspp-explorer#e=district_75390&s=...
California neighborhood map with crime and population layers, but AreaVibes already does this better.
Clean opening tree, but Lichess offers this for free with real games.
Client-side visual regression without CI setup — just drop a script tag and go.
Yet another OpenAPI validator when Spectral and Redocly already exist.
Yet another disk usage TUI when ncdu and gdu already dominate this space.
Cytoscape.js graph traversal through 3M Wikidata entities with trivia mode.