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Tools worth knowing about

Grouped by the job each one does, because that is usually what you arrived with. Curated by hand, each linked to its wiki entry and re-checked on a rolling cadence. A listing whose site stops answering keeps its place with a visible marker — a dead tool is a record, not an embarrassment.

Sorted by category name, A to Z; then listing name, A to Z within each category. Nothing on this site is ordered by payment.

All 35 listings, A to Z

Sorted by name, A to Z. Nothing on this site is ordered by payment.

agents

let a model take actions on its own — drive a browser, run a crew of workers

  • browser-use

    library free, open source (MIT); commercial cloud products billed by token and by browser-hourverified browser-use

  • CrewAI

    free, open-source framework (MIT); the hosted Enterprise platform is custom-pricedverified CrewAI

audio

speech in and speech out

  • Deepgram

    pay-as-you-go, metered per minute of audio for speech-to-text and per character for text-to-speech, with a free starting creditverified Deepgram

  • ElevenLabs

    free tier; monthly subscriptions metered in creditsverified ElevenLabs

coding

write and edit code with a model in the loop

  • Aider

    free, open source (Apache-2.0); you supply your own model API keyverified Aider

  • Continue

    free, open source (Apache-2.0)verified Continue

  • Cursor

    free tier; individual and team subscriptions per user per monthverified Cursor

data

find, extract and label the weights and documents a model works from

  • Argilla

    free, open source (Apache-2.0); no separate paid tier publishedverified Argilla

  • Hugging Face Hub

    free for public models and datasets; paid tiers for private storage, compute and organisation controlsverified Hugging Face Hub

  • Unstructured

    open-source library free (Apache-2.0); hosted platform has a free page allotment, then pay-per-page, plus a custom Business planverified Unstructured

evaluation

test what a model produces before you ship it, and constrain it while it runs

  • Guardrails AI

    core validation framework free, open source (Apache-2.0); Guardrails Hub and the enterprise platform are not publicly pricedverified Guardrails AI

  • promptfoo

    free, open source (MIT) as a CLI and library; hosted Enterprise and on-premise tiers are custom-pricedverified promptfoo

frameworks

compose model calls, tools and retrieval into a program

  • DSPy

    free, open source (MIT)verified DSPy

  • LangChain

    libraries free and open source (MIT); hosted platform free for one seat, then per-seat and usage-basedverified LangChain

image

generate an image, or read what is in one

  • ComfyUI

    free, open source (GPL-3.0) to run locally; a paid cloud service is offered separatelyverified ComfyUI

  • Ultralytics

    dual-licensed: free under AGPL-3.0 for open-source use; a commercial Enterprise license is required for closed-source use, custom-pricedverified Ultralytics

inference

call a model over an API, or serve one under load

  • Fireworks AI

    usage-based: per-token for serverless inference, per-GPU-second for dedicated deployments, per-token for fine-tuning; free starter creditverified Fireworks AI

  • GroqCloud

    pay per million input and output tokens, priced per modelverified GroqCloud

  • OpenRouter

    pay per token from prepaid credits; no subscriptionverified OpenRouter

  • Replicate

    pay per second of compute; some models billed per token or per imageverified Replicate

  • vLLM

    free, open source (Apache-2.0)verified vLLM

local

run a model on hardware you already own

  • llama.cpp

    free, open source (MIT)verified llama.cpp

  • llamafile

    free, open source (Apache-2.0)verified llamafile

  • LM Studio

    free desktop app; cloud inference sold as prepaid creditsverified LM Studio

  • Ollama

    free, open source (MIT); hosted models sold separatelyverified Ollama

  • Open WebUI

    free to self-host; paid enterprise plans for single sign-on, audit logs and air-gapped deploymentverified Open WebUI

observability

see what your model calls cost and what they actually returned

  • Helicone

    free, open source (Apache-2.0) to self-host; hosted cloud has a free tier, then flat-rate plans plus usage-based overageverified Helicone

  • Langfuse

    free to self-host; cloud has a free tier, then monthly plans by usageverified Langfuse

  • PromptLayer

    free tier, then flat per-seat monthly plans plus usage-based overage; custom Enterprise pricingverified PromptLayer

retrieval

store embeddings and search your own documents so a model can answer from them

  • Chroma

    free, open source (Apache-2.0) to self-host; managed Chroma Cloud is usage-based with a free starter allotmentverified Chroma

  • LlamaIndex

    framework free and open source (MIT); hosted document parsing sold in credits with a free monthly allowanceverified LlamaIndex

  • Qdrant

    free, open source (Apache-2.0) to self-host; managed cloud has a free cluster, then usage-based pricingverified Qdrant

training

fine-tune a model on your own data, and keep the record of the runs

  • Axolotl

    free, open source (Apache-2.0); no vendor-hosted productverified Axolotl

  • Unsloth

    free, open source (Apache-2.0)verified Unsloth

  • Weights & Biases

    free for personal, non-commercial use; paid team plans billed per seat, custom Enterprise pricingverified Weights & Biases