Both are free! Modified BSD License (3-clause, BSD-new) for D3.js and MIT and GPL for jQuery.
Various date/time calculation and formatting utils. Time scales and intervals.
Various classes to convert data to meaningful numbers for graps. Stack, tree, pie, and others.
GeoJSON parsers and shape drawing utlis. Map projections and specialized scales
Geom: Specific layouts for exotic charts;
Chart: Box, bullet, horizon charts (so far)
D3.js source code has collection of examples. Here are few that I like the most.
No, just consider following about those tools:
Clone git repository or download a release, explore examples!
(it's better to have a web-server to look at them)
Modify them with your data or try to visualize differently.
(feel free to improve them and offer your ideas back to developers)
Don't forget to use in-browser tools to peek behind the curtains.
Join D3 discussion group to find inspiration or to solve a problem.
Read more about SVG
Continue to use D3.js more
Try look for alternative visualisations for particular data
What are yours after this introduction?