This website has been around for quite a while (I think, anyway) but I only recently came across it from another tech blog I was browsing through. I find it really useful for determining the most popular software as well as search engines, ISPs, and more!
It can also show you trends – so you can see where browsers (for example) are going in terms of how popular they are. There are some handy graphs and charts.
It doesn’t cost anything and be extremely handy. I shall definitely be referring to it in future posts as I think it can be very useful.