Sourcing List: OSS Infrastructure, Cloud Monetization, Founded ~2024+
Note: I've prioritized companies I'm confident are real; founding dates for very young startups can be fuzzy (incorporation vs. launch), so a couple may straddle late 2023.
- Browser Use — Open-source library for letting AI agents control web browsers; monetizes via a hosted cloud API. Founded 2024, YC W25, went viral on GitHub (one of the fastest-growing repos of the year), raised a seed round in 2025.
- Letta — OSS framework for stateful LLM agents with long-term memory (spun out of the MemGPT research project at UC Berkeley); Letta Cloud is the paid offering. Founded 2024 with a ~$10M seed led by Felicis.
- Mem0 — Open-source memory layer for AI applications; hosted managed platform is the revenue engine. Strong GitHub traction (tens of thousands of stars), YC-backed, raised institutional funding in 2024–25.
- Hatchet — Open-source distributed task queue / background job orchestrator built on Postgres; Hatchet Cloud is the managed version. YC W24, appealing "Celery replacement" wedge with real developer adoption.
- Steel — Open-source browser infrastructure API for AI agents (headless browsers as a primitive); monetizes with a hosted cloud fleet. Founded 2024, YC-backed, riding the agent-infra wave.
- TensorZero — Open-source LLM gateway unifying inference, observability, evals, and fine-tuning feedback loops. Founded 2024 by an ex-Rockset ML lead; raised seed funding in 2025; classic open-core-to-cloud trajectory.
- Julep — Open-source platform/API for building multi-step AI agent workflows; hosted cloud version for production use. Founded ~2024, seed-stage, growing OSS community.
- Comfy Org — The company formed in 2024 around ComfyUI, the dominant open-source node-based interface for diffusion model workflows; monetizing via hosted/cloud offerings and API. Massive installed base before the company even existed — rare distribution advantage.
- Dokploy — Open-source self-hostable PaaS (Vercel/Heroku alternative built on Docker); Dokploy Cloud is the paid managed tier. Launched 2024, rapid GitHub star growth, bootstrapped/very early — genuinely under the radar.
- Rybbit — Open-source, privacy-first web analytics (Google Analytics alternative); monetizes via hosted cloud plans. Launched 2024–25, strong Hacker News/GitHub debut, pre-institutional — earliest-stage name on this list.
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White-space gaps noticed while sourcing
- *Open-source infrastructure for agent state, not agent actions.* The 2024 cohort is crowded with browser control and orchestration (Browser Use, Steel, Julep), but durable primitives — versioned agent memory stores, replayable execution logs, cross-agent identity/permissions — are thin. Letta and Mem0 touch memory, but nobody owns "Postgres for agents" yet.
- OSS cloud-cost and GPU-efficiency control planes. Despite inference spend exploding, there are surprisingly few new (2024+) open-source companies doing GPU scheduling, multi-cloud inference arbitrage, or FinOps for AI workloads as open-core. The incumbents here (SkyPilot lineage, older FinOps tools) predate the current cost crisis — a fresh OSS entrant with a managed cloud could win developer mindshare quickly.