This tool allows you to insert either a whole abstract or some keywords, to find related journals, their influence and other benefits (like being available for free after a certain amount of time). It also allows you to find relevant authors and the relevant articles they write.
I tried this tool on two recent drafts I finished and immediately came up with new ideas on where to submit them, confirmed my choice of a high-impact journal for another, and found a whole new stream of publications related specifically to the topic. I would not have found these articles otherwise, so I can certainly vouch for the ability of the tool.
This one is going straight in the bookmarks and will be accessed often.