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   * [OCR.Space](https://ocr.space/) — An OCR API which parses image and pdf files returning the text results in JSON format. 25,000 requests per month free.
   * [Duply.co](https://duply.co) — Create dynamic images from API & URL, design template once and reuse it. Free tier offers 70 images/month creation from API & URL and Up to 100 through Form.
   * [OpenAPI3 Designer](https://openapidesigner.com/) — Visually create Open API 3 definitions for free.
+  * [Orchest](https://orchest.io) — Visual pipeline editor and workflow orchestrator for data science, 1 instance for free, open source version available.
   * [parsehub.com](https://parsehub.com/) — Extract data from dynamic sites, turn dynamic websites into APIs, 5 projects free.
   * [Pixela](https://pixe.la/) - Free daystream database service. All operations are performed by API. Visualization with heat maps and line graphs is also possible.
   * [Postbacks](https://postbacks.io/) - Request HTTP callbacks for a later time. 8,000 free requests on signup.