I use a handful of domain investing tools on a daily basis. The primary purpose is evaluating domain names I want to buy in auction, but I also use some of these tools to price my own domain names and submit educated offers on domain names I want to buy. I also use some of these tools to do background research for domain name related articles on my blog.
About half of the tools I use every day are available for anyone to use for free. Some offer paid account options as well, but have free versions that come with limits on searches and functionality. Other tools are paid and have different fee structures, primarily based on usage and the tools that are used on the platform. One tool I use is paid, but I have been given a journalist account that allows me to use it for research at no cost.
Here is a list of the domain tools I use just about every day:



