Citation indexes enable you to find the most cited articles by finding other papers which have cited them since they were published. You can also use them to find the best journals to publish in. We have a subscriptions to Web of Science.
Please do follow the advice in other boxes to make sure you get published in a quality journal.
There are journals which have been set up specifically to capture open access papers and their quality has been questionned.
This independent website may be of use if you are concerned about a specific title or publisher:
These links are to alternative sources of information on research journals:
These two resources go beyond conventional citation counts and into social media and the web to create impact measures.
Although this is a talk about getting published in IEEE journals, the lessons and advice are universal.