gstack gained 12,654★ this week — plus 3 tools you should know

The Lens

GStack gives you 15 opinionated tools and 9 workflow skills that do exactly that. Install it, and suddenly your terminal has slash commands for code review, shipping, browser automation, QA testing, and retrospectives. Garry Tan (YC CEO) built this for his own workflow and claims 10K lines of code and 100 PRs per week using it, in weeks. The tools include a persistent Chromium browser daemon for visual testing, plan review that catches issues before you write code, and one-command deploys. Everything lives inside .claude/; nothing touches your PATH, nothing runs in the background except the browser daemon. TypeScript core with some Go for performance. The catch: this is one person's extremely opinionated workflow. If your development style doesn't match Garry's, you'll fight the tools instead of using them. And it's Claude Code only: no Cursor, no Codex, no other agent.

The Lens

OpenSpace makes agent skills self-evolving, running experiments and keeping what works based on results. Instead of static prompt files, skills are living entities that automatically select themselves, monitor their performance, and evolve based on results. Basically, Darwinian selection for agent capabilities. Three evolution modes: FIX (repair broken skills), DERIVED (create new skills from existing ones), and CAPTURED (learn skills from successful runs). The result is a 46% reduction in token usage and 4.2x higher income compared to baseline agents in their benchmarks. Uses Qwen 3.5-Plus as the backbone LLM. MIT licensed. Integrates with MCP servers (GitHub, Slack, etc.) and stores evolved skills in a local SQLite database you can inspect. The catch: the benchmarks are impressive but from an academic lab (HKU). Real-world skill evolution is messier than controlled experiments. The community cloud (open-space.cloud) is new and the shared skill library is still sparse. And 'self-evolving' means your agent's behavior can change in ways you didn't explicitly approve.

The Lens

Lightpanda is a headless browser built from scratch in Zig specifically for speed. We're talking 10-50x faster than Chromium-based headless browsers for page loading and JavaScript execution, at a fraction of the memory. The target audience is anyone running browsers at scale: scraping pipelines, automated testing farms, AI agents that need to browse the web. When you're paying per minute of compute and per GB of RAM, a browser that uses 90% less of both changes your infrastructure costs dramatically. AGPL-3.0 license. They offer a cloud service alongside the open source browser. The catch: it's not a full browser. It doesn't render pixels: no screenshots, no visual testing. JavaScript support is growing but not at Chrome-level compatibility. Sites with complex JS frameworks may not work correctly yet. And AGPL means if you modify it and serve it to users, you must open source your changes.

The Lens

This Claude Code skill turns any repository into a beautiful, interactive single-page HTML course. Point it at a codebase, and it generates a structured learning experience that walks through the architecture, key files, and how everything connects. Built specifically for non-technical 'vibe coders' who learn by doing and want to understand what they built (or what someone else built). The output is a single HTML file you can share, host, or open locally. No language specified in the repo. It's a Claude Code skill file, not a traditional software project. The catch: the quality depends entirely on Claude's understanding of the codebase. Complex, poorly-documented codebases will produce courses with gaps. And 'single-page HTML' means everything is in one file. Great for sharing, awkward for very large codebases. This is a skill, not a product. It runs inside Claude Code only.