360 Merge Duplicate App provides you the single as well as bulk merge on Account/ Contact/Lead. The App quickly searches the record saving a lot of time and further you can go for single/bulk merging as per your requirement. The App is easy to use. Have a look at this link- https://appexchange.salesforce.com/listingDetail?listingId=a0N30000000qCzXEAU Or for further queries contact at- support@360degreeapps.com
There are many free appexchange apps for same.. Check it appexchange..
Have a look at this link-
https://appexchange.salesforce.com/listingDetail?listingId=a0N30000000qCzXEAU
Or for further queries contact at- support@360degreeapps.com