If you want to know about links, this one is the tool to use. While others have some link data, majestic and their 2 databases, historical and fresh always have more data then any other 3rd party source. Don't get fooled into buying from a company that does this that and everything else, as trust me their garbage, or don't trust me and just compare for yourself:
Your own back links, this is where to get data on the sites linking to yours, the pages they link to, and the text they used: