To start with Stat Counter is free yet it is still an amazingly reliable piece of software that will give you invaluable information so that you can check the visitors to your website.
It is invisible so nobody can see that it is installed on your website and it gives a real time analysis of what is going on.
You simply place a small piece of code on your web page or blog and that is all you have to do. All of the traffic coming to your website is analysed in real time.
A...

AreMySitesUp.com is a fantastic website service that basically does exactly what is says on the tin. It checks to see if your websites are up and working OK.
This service is ideal for so many people and can end up saving you quite a bit of money.
There are two versions, a free version and a premium version. The free version checks your websites 25 times a day which equates to a little more than once every hour.
The paid version visits your websites every 15 minutes.
...