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   * [Cloudmersive](https://cloudmersive.com/) — Utility API platform with full access to expansive API Library including Document Conversion, Virus Scanning, and more with 800 calls/month.
   * [Colaboratory](https://colab.research.google.com) — Free web-based Python notebook environment with Nvidia Tesla K80 GPU.
   * [Collect2](https://collect2.com) — Create an API endpoint to test, automate, and connect webhooks. Free plan allows for two datasets, 2000 records, 1 forwarder, and 1 alert.
+  * [CurlHub](https://curlhub.io) — Proxy service for inspecting and debugging API calls. Free plan includes 10,000 requests per month.
   * [CurrencyScoop](https://currencyscoop.com) - Realtime currency data API for fintech apps. Free plan includes 5000 calls per month.
   * [Datapane](https://datapane.com) - API for building interactive reports in Python and deploying Python scripts and Jupyter Notebooks as self-service tools.
   * [DB Designer](https://www.dbdesigner.net/) — Cloud based Database schema design and modeling tool with a free starter plan of 2 Database models and 10 tables per model.