Tools
Document Processing
- Squoosh: Image compression web app provided by Google.
- PDF2JPG: Free PDF to JPG online converter
- Smallpdf: All-in-one easy-to-use online PDF tools
- Convertio: Convert your files to any formats (300+ formats supported)
- ILovePDF: Every tool you need to work with PDFs in one place
- ILoveIMG: Every tool you could want to edit images in bulk
- cpdf: Command line tool to manipulate existing PDF files
- pdftk: The PDF toolkit for doing everyday things with PDF documents
- WebPlotDigitizer: Web based tool to extract data from plots, images, and maps
Web
- IPIP: The best IP database I’ve used
Programming
General tools
- regex101: Online regular expressions tester and debugger.
- strftime: Python strftime reference.
- DevDocs: API documentations of multiple programming languages/tools in one place
- Choose an open source license: Simple way to choose a license
Python
- Flake8: Python style guide checker
ESL (English as a Second Language)
- Grammarly: Free writing assistant to check your grammar