Test Automation tools: trends

While making decision which tool is more suitable for test automation we should always take into account the popularity of each specific tool. Why? Because firstly it's about people. What's the point in taking tool which doesn't have users? Thus, we'll have to invest some money into their learning which is extra expences. Secondly, the more popular tool is the more materials are available either in internet or in some other materials. So, we should take a look at some trends to identify which tool is growing with it's popularity and which one is going to be a history.