Today's GitHub repos: Sept 21, 2026

affaan-m/ECC is new at 1 on the GitHub board dated 2026-09-21T08:01:37.804638, with 264121 stars on the live repo page. BuilderIO/agent-native is new at 2 with 5464 stars. cloudflare/security-audit-skill falls 1 to 3 after leading yesterday. Five of yesterday's 10 leave: addyosmani/agent-skills, coder/coder, docling-project/docling, cloudflare/quiche, asciimoo/hister. The board is an agent-tooling swap, not a language-runtime story.

affaan-m/ECC: JavaScript agent-runtime optimization system for Claude Code, Codex, OpenCode, and Cursor. TopAIRepos put stars at 262946 on September 20; the GitHub page fetch on this run showed 264121. New at 1. Do not copy the repo tagline into other copy: it uses a banned word.
BuilderIO/agent-native: TypeScript framework for agent-native apps (actions, chat, MCP, CLI) at agent-native.com. GitHub fetch: 5464 stars. Created 2026-03-12. New at 2.
cloudflare/security-audit-skill: Coding-agent skill for multi-phase security audits with machine-readable findings. GitHub fetch: 18420 stars. Falls 1 to 3.
trycua/cua: Open-source computer-use stack (drivers, sandboxes, benchmarks) at cua.ai. GitHub listing: 22122 stars. Falls 2 to 4 after yesterday's 2.
anthropics/financial-services: Claude plugin marketplace for investment banking, equity research, private equity, and wealth workflows. Official docs at claude.com/docs/office-agents/fsi-plugins. New at 5.
paperless-ngx/paperless-ngx: Document management system that OCRs and archives scans. GitHub listing: 43601 stars. New at 6.
anthropics/claude-code: Terminal coding agent. GitHub fetch: 147317 stars. Falls 5 to 7 after sitting at 5 yesterday and 2 on September 19.
mihail911/modern-software-dev-assignments: Course assignment repo for modern software development. New at 8. No widely reported news trigger identified for September 21, 2026 beyond the GitHub ranking itself.
higgsfield-ai/higgsfield: Higgsfield AI open repo that sat at 7 yesterday. Falls 7 to 9. Still on the board after the agent-skill wipe.
Open-Dev-Society/OpenStock: Self-hosted stock dashboard on Finnhub data, AGPL. AIPMClub dated an OpenStock mention to a September 20 digest at about 16100 stars. Falls 6 to 10.

The live ranked board beyond the public top 10 is available via the Trends MCP API. Get your free API key

What changed on GitHub since yesterday

New: affaan-m/ECC (1), BuilderIO/agent-native (2), anthropics/financial-services (5), paperless-ngx/paperless-ngx (6), mihail911/modern-software-dev-assignments (8).
Movers: none at 5-plus among overlapping names. security-audit-skill 1 to 3. claude-code 5 to 7. OpenStock 6 to 10.
Dropped: addyosmani/agent-skills (3), coder/coder (4), docling-project/docling (8), cloudflare/quiche (9), asciimoo/hister (10).

What today's GitHub trends reveal

Five new names is a real turnover day after yesterday's security-audit-skill lead. ECC at 1 with 264121 stars is a recurring agent-runtime fixture returning to the daily 10, not a brand-new repo. agent-native at 2 (5464 stars) is the small, new-framework contrast sitting next to claude-code at 147317 stars in 7th.

Anthropic occupies two rows (financial-services 5, claude-code 7). Cloudflare's security-audit-skill stays on the board at 3 after losing 1. The GitHub Trending Repos API stamp 2026-09-21T08:01:37.804638 is an agent-tooling board with a document-scanner and a stock dashboard at 6 and 10.

Track these trends in real time with Trends MCP

This ranked list came from the Trends MCP get_top_trends tool. The same API is built for analysts, developer-relations teams, and agents who need a dated board instead of a screenshot. get_growth was skipped: GitHub rows are repos, not keyword sources. Star counts above are from GitHub page fetches on this run. The matching data source page is GitHub Trending Repos API.