An entertainment

https://formbuilder.online/

 ++

https://www.epicgames.com/unrealtournament/en-US/#maps

http://quetoo.org/

https://zandronum.com/

http://www.truecombatelite.com/

http://tesseract.gg/

https://unity.com/fps-sample

Communication without internet and simcard:

https://play.google.com/store/apps/details?id=com.remaller.android.wifitalkie_lite&hl=en&gl=US

https://null-byte.wonderhowto.com/how-to/build-off-grid-wi-fi-voice-communication-system-with-android-raspberry-pi-0296270/

MORE FROM FLAVIO:

Read about:

Algorithm Complexity and Big O Notation

Linear Search in JS

Binary Search in JS

Selection Sort in JS

Quicksort in JS

Merge Sort in JS

https://symfony.com/

https://vuejs.org/