I will add more sites here, so keep visiting
You do not need any credit card to get free 1 month trial. You need only email id and even you can use disposable email id to get it.
You cannot install anything on this machine. You can install some cloud software which is provided by company itself.
In real manner, it is full restriction to avoid abuse. You can watch YouTube, surf internet.
It also provides cloud based platform for lifetime where you can test cloud. You can use it without paying anything. You need Bing email id to get free trial.
External sites are blocked, so you can download any software and because of it. It is possible that you can install third party software but without internet, it is even not possible.
It also provide free of cost without any timeline limit but you cannot install any software. you need valid email to signup.
It provide free for 12 days. You need to sign up for it. They have only linux OS and do not provide windows. You can use even cPanel in that.