If you want to contribute to this list (please do), send me a pull request. Since we want this list to be useful in the long run, please submit high quality links only.
Please ensure your pull request adheres to the following guidelines:
- Please make an individual pull request for each suggestion.
- Please only submit resources that are completly free to access.
- The pull request and commit should have a useful title.
- Please search previous suggestions before making a new one, as yours may be a duplicate.
- Make sure your link has a useful and relevant title.
- Please use title-casing (AP style).
- Please use the following format:
[Useful Title](link) - Link additions should be added to the bottom of the relevant category.
- New categories or improvements to the existing categorization are welcome.
- Please check your spelling and grammar.
Thank you for your suggestions!