Emoncms is a powerful open-source web-app for processing, logging and visualising energy, temperature and other environmental data.
Part of the OpenEnergyMonitor.org project.
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Documentation for how to install, upgrade, use and backup emoncms is available on the emoncms github repository.
We believe open source is a better way of doing things. Emoncms is available under the GPL Affero licence (AGPL).