Merge branch 'EbookFoundation:main' into patch-1

.github/workflows/check-urls.yml

@@ -42,7 +42,7 @@ jobs:
           fetch-depth: ${{ steps.set-params.outputs.fetch-depth }}
       - name: Get changed files
         id: changed-files
-        uses: tj-actions/[email protected].4
+        uses: tj-actions/[email protected].5
         with:
           separator: " "
           json: true

books/free-programming-books-subjects.md

@@ -868,6 +868,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Crypto 101 - Crypto for everyone](https://www.crypto101.io)
 * [Cryptography](https://en.wikibooks.org/wiki/Cryptography) - Wikibooks (HTML) *(:construction: in process)*
 * [CryptoParty Handbook](https://unglue.it/work/141611/)
+* [Fuzzing Book](https://www.fuzzingbook.org) - Andreas Zeller, Rahul Gopinath, Marcel Böhme, Gordon Fraser, Christian Holler (HTML)
 * [Gray Hat Hacking: The Ethical Hacker's Handbook](https://pages.cs.wisc.edu/~ace/media/gray-hat-hacking.pdf) - Allen Harper, Jonathan Ness, Chris Eagle, Shon Harris, Gideon Lenkey, Terron Williams (PDF)
 * [Handbook of Applied Cryptography](https://cacr.uwaterloo.ca/hac/index.html)
 * [How HTTPS works](https://howhttps.works) - dnsimple
@@ -945,6 +946,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Category Theory for Programmers](https://github.com/hmemcpy/milewski-ctfp-pdf) - Bartosz Milewski (PDF)
 * [Delftse Foundations of Computation](https://textbooks.open.tudelft.nl/textbooks/catalog/book/13) - Stefan Hugtenburgand, Neil Yorke-Smith @ TU Delft Open (PDF)
 * [Homotopy Type Theory: Univalent Foundations of Mathematics](https://homotopytypetheory.org/book/) (PDF)
+* [Introduction to Theoretical Computer Science](https://files.boazbarak.org/introtcs/lnotes_book.pdf) - Boaz Barak (PDF)
 * [Introduction to Theory of Computation](https://cglab.ca/~michiel/TheoryOfComputation/) - Anil Maheshwari, Michiel Smid (PDF)
 * [Models of Computation](https://cs.brown.edu/people/jes/book/) - John E. Savage
 * [Principles of Programming Languages](https://web.archive.org/web/20150418034451/http://www.cs.jhu.edu/~scott/pl/book/dist/) - Scott F. Smith *(:card_file_box: archived)*

more/free-programming-playgrounds.md

@@ -323,6 +323,7 @@
 * [Codepad](http://codepad.org/?lang=PHP)
 * [ExtendsClass](https://extendsclass.com/php.html)
 * [PHP Online Compiler](https://www.codinguru.online/compiler/php)
+* [PHPHub](https://phphub.net/sandbox/)
 * [PHPTester](http://phptester.net)
 * [SoloLearn](https://code.sololearn.com/php)