letta alternatives

letta-ai/letta (25k stars, +160 this week): Platform for stateful agents: AI with advanced memory that can learn and self-improve over time.

Below are 12 other LLM tooling repos tracked by OSS Radar that share at least two GitHub topics with letta, 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. rohitg00/ai-engineering-from-scratch

   +3.3k/wkest.

   Learn AI Engineering! Learn it. Build it. Ship it for others.

   71k stars · Python · shared topics: ai, ai-agents, llm · ai-engineering-from-scratch alternatives

2. 2. NousResearch/hermes-agent

   +2k/wkest.

   The agent that grows with you.

   255k stars · Python · shared topics: ai, ai-agents, llm · hermes-agent alternatives

3. 3. deeplethe/solid-glass

   +2k/wk

   A design system for AI applications. Material, physical, tactile, technical.

   2k stars · TypeScript · shared topics: ai, ai-agents, llm · solid-glass alternatives

4. 4. unclecode/crawl4ai

   +438/wkest.

   Open-source web crawler and scraper for LLMs and AI agents: any website into clean, LLM-ready Markdown.

   86k stars · Python · shared topics: ai, ai-agents, llm · crawl4ai alternatives

5. 5. asgeirtj/system_prompts_leaks

   +403/wkest.

   Documented system prompts from Anthropic - Claude Fable 5.1, Opus 5.5, Claude Design, Claude Code. OpenAI - ChatGPT GPT-6-Astra, Codex.

   70k stars · Python · shared topics: ai, ai-agents, llm · system_prompts_leaks alternatives

6. 6. mem0ai/mem0

   +375/wkest.

   The Memory Layer for AI Agents - Drop-in memory infrastructure for AI agents and apps. Context that persists. Built for production.

   67k stars · Python · shared topics: ai, ai-agents, llm · mem0 alternatives

7. 7. langchain-ai/langchain

   +351/wkest.

   The agent engineering platform.

   148k stars · Python · shared topics: ai, ai-agents, llm · langchain alternatives

8. 8. langchain-ai/langgraph

   +343/wkest.

   Build resilient agents.

   43k stars · Python · shared topics: ai, ai-agents, llm · langgraph alternatives

9. 9. thesysdev/open-intelligent-ui

   +341/wkest.

   An open-source take on ChatGPT's Intelligent UI: answers stream as interactive UI (maps, photos, charts, drawings and working tools).

   537 stars · TypeScript · shared topics: ai, ai-agents, llm · open-intelligent-ui alternatives

10. 10. Ebony-Vinyl/dsh-our-free-model

    +15k/wkest.

    All you do is install this plugin in dsh: no login, no sign-up, no API key — the frontier models are just there, DeepSeek V4.1 Flash and…

    25k stars · JavaScript · shared topics: ai-agents, llm · dsh-our-free-model alternatives

11. 11. MadsLorentzen/ai-job-search

    +9k/wkest.

    The job search that runs on your machine. AI job application framework built on Claude Code: evaluate postings, tailor CVs, write cover…

    53k stars · Python · shared topics: ai, ai-agents · ai-job-search alternatives

12. 12. affaan-m/ECC

    +6.6k/wkest.

    The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code…

    283k stars · JavaScript · shared topics: ai-agents, llm · ECC alternatives

More: all trending LLM tooling repos · compare letta with the top 2 · alternatives to other trending repos