sepia alternatives

Nanako0129/sepia (3.2k stars, +42 this week): De-AI writing skill for any Agent Skills-compatible agent (77+ via the Skills CLI), with native plugins for Claude Code, Codex, Grok Build… Why it matters: useful plumbing for shipping LLM-powered features.

Below are 12 other LLM tooling repos tracked by OSS Radar that share at least two GitHub topics with sepia, ordered by how many topics overlap, then by stars gained in the last 7 days. Topic overlap means a similar problem space, not a drop-in replacement, so check each project's README.

1. 1. DietrichGebert/ponytail

   +1.3k/wkest.

   Makes your AI agent think like the laziest senior dev in the room. The best code is the code you never wrote. Why it matters: useful plumbing for shipping LLM-powered features.

   163k stars · JavaScript · shared topics: agent-skills, claude-code, developer-tools, llm, prompt-engineering

2. 2. Graphify-Labs/graphify

   +392/wkest.

   Turn any codebase, with its docs, SQL schemas, configs, and PDFs, into a queryable knowledge graph. Why it matters: useful plumbing for shipping LLM-powered features.

   126k stars · Python · shared topics: antigravity, claude-code, codex, developer-tools, llm

3. 3. lidge-jun/opencodex

   +84/wkest.

   Universal provider proxy for OpenAI Codex & Claude Code — use any LLM (Claude, Gemini, Grok, DeepSeek, Ollama…) with Codex CLI, App, SDK… Why it matters: useful plumbing for shipping LLM-powered features.

   17k stars · TypeScript · shared topics: claude-code, codex, developer-tools, grok, llm

4. 4. asgeirtj/system_prompts_leaks

   +77/wkest.

   Documented system prompts from Anthropic - Claude Fable 5.1, Opus 5.5, Claude Design, Claude Code. OpenAI - ChatGPT GPT-6-Astra, Codex. Why it matters: useful plumbing for shipping LLM-powered features.

   70k stars · Python · shared topics: claude-code, codex, grok, llm, prompt-engineering

5. 5. trailhq/Trail-Code

   +119/wkest.

   Turbocharge Claude Code, Cursor, Codex, Gemini & every coding agent: faster, cheaper, with contextual understanding specific to your… Why it matters: useful plumbing for shipping LLM-powered features.

   10k stars · TypeScript · shared topics: claude-code, codex, developer-tools, llm

6. 6. qunqin24/Pulse

   +42/wkest.

   Know how much Claude Code, Codex, Cursor, Copilot and 70+ other AI coding tools you have left — a free, open-source macOS monitor on the… Why it matters: useful plumbing for shipping LLM-powered features.

   544 stars · Swift · shared topics: antigravity, claude-code, codex, llm

7. 7. affaan-m/ECC

   +945/wkest.

   The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code… Why it matters: useful plumbing for shipping LLM-powered features.

   279k stars · JavaScript · shared topics: claude-code, developer-tools, llm

8. 8. iOfficeAI/AionUi

   +542/wkest.

   Open-source 24/7 Cowork app for OpenClaw, Hermes, Claude Code, Codex, OpenCode and 20+ more CLI Agent | Customize your assistants | Team… Why it matters: useful plumbing for shipping LLM-powered features.

   34k stars · TypeScript · shared topics: claude-code, codex, llm

9. 9. NousResearch/hermes-agent

   +539/wkest.

   The agent that grows with you. Why it matters: useful plumbing for shipping LLM-powered features.

   254k stars · Python · shared topics: claude-code, codex, llm

10. 10. JuliusBrussee/caveman

    +525/wkest.

    🪨 why use many token when few token do trick. Viral skill + proxy for coding agents that cuts 65% of tokens by talking like a caveman. Why it matters: useful plumbing for shipping LLM-powered features.

    112k stars · Go · shared topics: claude-code, llm, prompt-engineering

11. 11. headroomlabs-ai/headroom

    +266/wkest.

    Compress tool outputs, logs, files, and RAG chunks before they reach the LLM. Why it matters: useful plumbing for shipping LLM-powered features.

    75k stars · Python · shared topics: claude-code, llm, prompt-engineering

12. 12. rtk-ai/rtk

    +196/wkest.

    CLI proxy that reduces LLM token consumption by 60-90% on common dev commands. Single Rust binary, zero dependencies. Why it matters: useful plumbing for shipping LLM-powered features.

    83k stars · Rust · shared topics: claude-code, developer-tools, llm

More: all trending LLM tooling repos · compare sepia with the top 2