What cool javascript libraries should become HTMLwidgets?

[tbradley]

@JamesF the future of ggvis was discussed in this thread:

Let's clarify the successor to ggvis

R's Shiny/web-facing answer to ggplot seemed at one point to be ggvis, but the package hasn't been developed or seriously maintained for a while now and probably deserves an official send off. It would be great to have some clarity about where the Tidyverse is heading in terms of synthesising the grammar of graphics philosophy with the DOM power of D3. There are a few competing packages out there, but it feels like there is a bit of a vision gap in this area. But I may well be a bit out of touch with latest thinking, so would be great to hear what prevailing views are.