Hot Projects · Week 38 · 2026

3 open-source projects to explore

MarkItDown, ECC, firstmate.

Selected by Maya ChenSource week September 18, 2026Published September 23, 2026Source snapshot September 18, 2026

Shown star changes use two real snapshots seven days apart; a project without both is marked “Not measured”. Figures are preserved as of September 18, 2026. The editor’s pick highlights one project from this edition.

Editor’s pick · MIT

MarkItDown

Convert PDFs, Office files, images, audio and HTML to structured Markdown for LLM and text-analysis pipelines.

View MarkItDown repository ↗

Weekly star growth: +2,685
Total stars at snapshot: 185,132
Useful for: Developers preparing mixed-format documents for LLM and text-analysis pipelines
Before you try it: Runs with the host process’s privileges; sanitize untrusted inputs and use the narrowest conversion method.
Latest activity at snapshot: v0.1.8b2 prerelease · Sep 14; repository push · Sep 16
License: MIT

Also selected · MIT

ECC

Add reusable agents, skills and rules for planning, testing and reviewing coding-agent work.

View ECC repository ↗

Weekly star growth: +5,271
Total stars at snapshot: 261,177
Useful for: Teams standardizing coding-agent planning, testing and review
Before you try it: Harness support varies; universal setup needs Node.js 18 or newer, and optional ECC Pro private-repository plans are paid.
Latest activity at snapshot: v2.2.1 release · Sep 8; repository push · Sep 17
License: MIT

Also selected · MIT

firstmate

Supervise multiple coding agents from one primary session with separate Git worktrees and visible terminal sessions.

View firstmate repository ↗

Weekly star growth: Not measured
Total stars at snapshot: 6,407
Useful for: Developers coordinating parallel coding tasks
Before you try it: Requires a supported agent harness, Git, authenticated GitHub CLI and session-backend tools.
Latest activity at snapshot: Repository push · Sep 18; no published release
License: MIT