From collectd Wiki

EcoStats
Type:	Web
License:	GPLv3
Language:	Python, JavaScript
Author:	Sergiusz Pawłowicz
List of front-ends
Collectd Graph Panel Collectd-web CollectGraph Collection 3 Collection 4 collectw EcoStats Graphs on Rails Heymon kcollectd Jarmon Visage

EcoStats is a web-based front-end for RRD files created by collectd. It displays real-time numerical information in a table and shows graphs when hovering above the values with the mouse.