My laptop RAM not enough for using multiple programs (PhpStorm, Vagrant ...) and it hangs, is there any free online resources, for remote development ?
Since you added the PHP-tag here is a online PHP testsite:
But i would recommend to you to hire a VPS where you can install everything you want and use SSH to log into.
Not entirely for your case but you can use VS Code Online as "full" fledged IDE in the webbrowser. You can work on local code when you don't have the rights to install something or there is an other problem. I don't use it but i think it can help.