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 * **[Latitude](https://github.com/latitude-dev/latitude-llm)**: Latitude is the open-source ai monitoring platform. ![Stars](https://img.shields.io/github/stars/latitude-dev/latitude-llm.svg?style=flat&color=green) ![Contributors](https://img.shields.io/github/contributors/latitude-dev/latitude-llm?color=green) ![LastCommit](https://img.shields.io/github/last-commit/latitude-dev/latitude-llm?color=green)
 * **[OpenLLMetry](https://github.com/traceloop/openllmetry)**: Open-source observability for your LLM application, based on OpenTelemetry. ![Stars](https://img.shields.io/github/stars/traceloop/openllmetry.svg?style=flat&color=green) ![Contributors](https://img.shields.io/github/contributors/traceloop/openllmetry?color=green) ![LastCommit](https://img.shields.io/github/last-commit/traceloop/openllmetry?color=green)
+* **[PromptLayer](https://github.com/MagnivOrg/prompt-layer-library)**: Prompt engineering platform with prompt management, versioning, evaluations, and LLM observability. One of the earliest prompt management tools, maintained since 2022. ![Stars](https://img.shields.io/github/stars/MagnivOrg/prompt-layer-library.svg?style=flat&color=green) ![Contributors](https://img.shields.io/github/contributors/MagnivOrg/prompt-layer-library?color=green) ![LastCommit](https://img.shields.io/github/last-commit/MagnivOrg/prompt-layer-library?color=green)
 * **[wandb](https://github.com/wandb/wandb)**: The AI developer platform. Use Weights & Biases to train and fine-tune models, and manage models from experimentation to production. ![Stars](https://img.shields.io/github/stars/wandb/wandb.svg?style=flat&color=green) ![Contributors](https://img.shields.io/github/contributors/wandb/wandb?color=green) ![LastCommit](https://img.shields.io/github/last-commit/wandb/wandb?color=green)
 
 ## Training