Over the last few weeks I've been working on Spud, an application that allows you to control a remote computer that you can see. For example, if you have a gaming PC connected to you TV, Spud lets you use a laptop as input.
It's optimised for low-latency, as it's intended for gaming. There are even a few parameters you can tune in the application. I built this mainly for myself, to solve a particular problem I had, but I hope that others find it useful too!