VNC Viewer

Honestly for me this one ended up being a surprise, but after I ended up accidentally running a machine learning process on my primary laptop that ended up taking several days, meaning that my computer had to be plugged in exclusively, this tool came to the rescue. The fact it is free for non-commercial use and allows me to remote into my laptop or desktop from even my phone or iPad is indispensable. Now with better planning I can put those same extreme workloads on my desktop and not worry about whether or not I can access them on the go. Even if you just have a laptop, and want access to only a couple things on the go I can not recommend this program more.