* Replace PDF version 2.1.1 with 2.2.1 for Python 2.
* Add the PDF version for Python 3.
* Add the current edition (HTML).

* Add the 2nd Edition.
* Update the 1st Edition's link to HTTPS.
* Correct the title.

* Update "How to Think Like a Computer Scientist: Learning with Python" and "Think Python"

* "How to Think Like a Computer Scientist: Learning with Python":
  * Fix obsolete links: update URI and use HTTPS.
  * Add more editions to the title.
* "Think Python":
  * It diverges from "How to Think Like a Computer Scientist: Learning with Python" with many changes. So Allen B. Downey is the single author of this title.
  * Move it up one level and add the first edition.

* Update "How to Think Like a Computer Scientist: Learning with Python" and "Think Python"

* Rearrange the links to meet the Formatting Guidelines.

* Add the 2nd Edition.
* Update the 1st Edition:
  * Replace the obsolete link with the current link.
  * Add the Interactive version link.

The book has changed its title to this.

Fix broken link (Julia book). Now it work

* adding a free book on react

* sorting

* Added 30 Days Of Vue Book

* access note for PDF
Co-authored-by: NEric Hellman <eric@hellman.net>

* Add Math Books from aimath.org

* Fix Trailing Slashes

* Fix Alphabetical Order?

* Fix Alphabetical Order

* Fixed language and categories

* Fixed language and categories for -ko.md

* Removed most PDF links from addition.

* Replace German Resource with Direct Link to PDF

* Broken links & listing removed

Broken links related to this website is removed along with its listings  (https://www.packtpub.com/)

* Updated

* Add Architecture Patterns with Python book

* Update to keep alphabetical order 

Following suggestion

* Remove dead link to "The Standard Python Library"

The link to the book "The Standard Python Library" hosted on effbot.org is dead, and I could not find another source that legally hosts that book.

* Update free-programming-books.md

The link to the book "The Standard Python Library" hosted on effbot.org is dead:

http://effbot.org/librarybook/

This change updates it to the one at archive.org.

* fix: CI linter config

* chore: lint all files

* Fix Contributing.md broken link

* Fixed broken links in free-programming-books-pt_BR.md

* Removed the broken link

There is no other link found, related to the book.

* Added vector calculus book

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

Fixed broken links for following books in C++ section:
* Hands-On System Programming with C++
* How to make an Operating System

Updated one of the URL's to a working one and removed a book which is no longer accessible (at least, couldn't find a legit source).

* #5204 Correct URL, and add direct PDF links to Competitive Programming books.

* Add author to Competitive Programming.

* reorganize files

1. make it easier to find files
2. reduce scrolling to get to README on main view of repo

* remove tr.txt again

Removal of "Learn Python in Y Minutes" from free-programming-books.md and addition to free-programming-cheatsheets.md
Co-authored-by: NEric Hellman <eric@hellman.net>

* Added Pandas books.

* Added empty line.

* Removed a tutorial from programming books and added it into tutorials.

* Removed single-item category, put Pandas tutorial under python.

Updated the link for:
Free eBook - Hands-On Natural Language Processing with Python

* Add Free and Open Machine Learning book to free-programming-books.md

* used suggested URL
Co-authored-by: NEric Hellman <eric@hellman.net>

* Add HTTPS and JS resources, check_urls=free-programming-books.md free-courses-en.md

* moved http and https sections into networking
Co-authored-by: NEric Hellman <eric@hellman.net>

* game AI Pro

* typo

* Java Bilgisayar Diliyle Programlama

* powershell 101

* added 100 (and counting) Laravel Quick Tips

* not free

* How HTTPS works

added django 3.1 official documentation to free-programming-books.md

* Added a pdf book on fortran. The book has tons of programing topics and gets in to programing history.

* alphabetize
Co-authored-by: NEric Hellman <eric@hellman.net>