Ask HN: Best way to display complex HTML tables online?

Has anyone come across a tool or service that allows non technical CMS users to build complex HTML tables for display on the web? I'm talking about stuff along this vain:

http://media.empr.com/documents/14/mpr-atotc_(otc_allergy_treatme_3316.pdf

We're thinking about building something custom - but would appreciate any insight as to how people may have tackled this before.