An update to my earlier review. The developer responded to my queries and dealt with the matter appropriately.
Please do not purchase any app or software from the developer Ruslan Hakimzhanov. This guy is downright dishonest and a cheat. I bought the BookmarkApp Chrome from him which didn't work. When I emailed Ruslan multiple times for a refund, he just simply ignored me. Worst experience ever!
Fast Bookmark Scanner II - Scan your bookmarks in order to delete duplicated links empty folders or merge duplicated folders.
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Bookmarks Clean Up - Find and remove duplicated bookmarks manually and in batches, get rid of broken bookmark links and empty folders.
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
LinkCollector - Bookmark manager.
syncmarx - A simple Web Extension for synchronizing bookmarks between browsers.