Hi there, I'm Matt Sergei (do call me Matt, please) and would like to help you -
if you provide more project specifications.
Neo4j is not free and I have less experience with it (can do with D3.js practically every chart) though I can possibly go for their trial version for 30 days.
Otherwise I'm a webmaster and developer for 26 years, scripting web charts more extensively in last 7+ years. The budget is small (less than my daily rate) yet I like to take new challenges and always like to help.
Regards and hope you're safe,
Matt