Are there any kits or products available for an exercise bike to connect to a PC so that you can get speed, calories, etc. tracked on a small application running in a PC (or Mac)?
Nearly all of the much more expensive exercise bikes have the ability to do this, or something similar.
I have seen everything from stores a file on a USB stick so that you can connect it to a pc and load in a special application, down to ones that save to a web based portal
For example - Life Fitness - 95R (£6495)
However, there are many many different manufacturers and I have no idea what is even available to you where you are... For something like this, you should really go to a specialist store (negotiate with prices you find online) and get help from someone experienced.