LibreChat

LibreChat is a self-hosted AI chat interface that connects to multiple LLM providers (OpenAI, Anthropic, Google, local models) through a single unified UI. Self-host it and your team gets a unified chat UI that works with whatever models you're paying for (or running locally). No vendor lock-in. MIT license. Multi-model conversations (start with GPT-4, switch to Claude mid-chat), file uploads, code interpreter, plugins, conversation search, and user management are all built in. Docker Compose setup gets you running in minutes.

Fully free to self-host. No paid tier, no gated features. You bring your own API keys. Running it locally with Ollama means zero API costs. Self-hosting ops: moderate. Docker Compose handles most of it, but you need MongoDB for the backend. Updates are frequent (active development), which means staying current takes attention. Figure 2-3 hours/month.

Solo: self-host, connect your API keys, done. Small teams: add user accounts, share a single deployment. Growing teams: works well but you'll want to think about rate limiting per user. Large orgs: evaluate security hardening. It's not built for enterprise compliance out of the box.

The catch: the feature velocity is both a strength and a risk. Breaking changes happen. And while it supports many providers, the quality of each integration varies. OpenAI is rock-solid, others can lag behind.