There are tons - both open source and hosted.

- Tableau isn't free but its very easy and popular in businesses these days

- Freeboard - open source http://freeboard.io/

- Geckoboard - hosted https://www.geckoboard.com/

- Dashing - open source http://shopify.github.io/dashing/

- http://www.datamation.com/open-source/50-open-source-replace... - 50 Open Source Replacements for Proprietary Business Intelligence Software (many likely have web interfaces)