Is there a plugin / widget for service links?

With the advent of an increasing number of interesting and popular resources, they begin to acquire a large number of additional services that simplify the work and make it more comfortable (for example, bit.ly for twitter), and sometimes it’s impossible to even surf conveniently without certain plug-ins or auxiliary resources (for example clipmarks in firefox'e, or for me as a user of a chrome notepad from google :)). And the number of such links is growing and growing. Displaying them on the bookmarks bar - littering it, or searching in favorites - is not very convenient, and for a long time. The question of my post is actually whether there is a plugin or widget that displays a separate (preferably drop-down by mouse hover and floating) panel for service links? Search on Google, alas, did not give anything. Thanks in advance.