[all] https://rextester.com/
[all] https://glot.io/
[all] http://ideone.com/
[all] http://codepad.org/
[all] https://www.jdoodle.com/
[all] https://www.codechef.com/ide
[all] https://code.hackerearth.com
[all] https://www.ideone.com/
c+java http://codetwist.com/
java http://browxy.com/
java http://www.javadecompilers.com/
php http://phpfiddle.org/
php http://phptester.net/
net/il http://dotnetfiddle.net/
js http://jsfiddle.net/ (use jQ v2.1, to show bootstrap option)
js http://jsbin.com/
js - http://codepen.io
css http://www.cssmatic.com
css http://css3generator.com/
nodejs http://jsapp.us/
python - http://salvatore.diodev.fr/pypybox/
Angular2 - https://plnkr.co
Angular & React - https://stackblitz.com/
React, Preact, Vue, Svelte - https://codesandbox.io
C++ (disassembly output) - https://gcc.godbolt.org/
C, C++, Python, Java, PHP, JS - https://www.onlinegdb.com/
bytecode to asm - https://zydis.re/
c++ to asm - https://godbolt.org
#fiddler
[all] https://glot.io/
[all] http://ideone.com/
[all] http://codepad.org/
[all] https://www.jdoodle.com/
[all] https://www.codechef.com/ide
[all] https://code.hackerearth.com
[all] https://www.ideone.com/
c+java http://codetwist.com/
java http://browxy.com/
java http://www.javadecompilers.com/
php http://phpfiddle.org/
php http://phptester.net/
net/il http://dotnetfiddle.net/
js http://jsfiddle.net/ (use jQ v2.1, to show bootstrap option)
js http://jsbin.com/
js - http://codepen.io
css http://www.cssmatic.com
css http://css3generator.com/
nodejs http://jsapp.us/
python - http://salvatore.diodev.fr/pypybox/
Angular2 - https://plnkr.co
Angular & React - https://stackblitz.com/
React, Preact, Vue, Svelte - https://codesandbox.io
C++ (disassembly output) - https://gcc.godbolt.org/
C, C++, Python, Java, PHP, JS - https://www.onlinegdb.com/
bytecode to asm - https://zydis.re/
c++ to asm - https://godbolt.org
#fiddler