From collectd Wiki

collectw
Type:	Web
License:	GPLv3
Language:	C, ECMAScript
Author:	Kayo Ayanami
List of front-ends
Collectd Graph Panel Collectd-web CollectGraph Collection 3 Collection 4 collectw EcoStats Graphs on Rails Heymon kcollectd Jarmon Visage

collectw is web-based front-end for collectd. It allows you to monitor collectd's statistics (optionally any RRD data) through your browser in a modern way. Data from RRD is passed as JSON to the web-browser and ECMAScript draws charts through it.