Online IDE and tools for practice

---

Online IDE for Programming languages:

https://repl.it/

https://www.w3schools.com/

https://www.w3schools.com/php/php_compiler.asp

https://ide.geeksforgeeks.org/

http://cpp.sh/

https://play.kotlinlang.org/

---

SQL

https://livesql.oracle.com/

https://www.w3schools.com/sql/trysql.asp?filename=trysql_op_in

https://www.tutorialspoint.com/execute_sql_online.php

https://sqliteonline.com/

http://www.sqlfiddle.com/

---

Code Endorsement

https://ideone.com/

---

online Markdown Editor

https://dillinger.io/

---

Python:

https://py3.codeskulptor.org/

---

Misc

https://cdecl.org/

---