Free Grow Software!

I also use Mycodo. For all my timers etc, switch relays for lights, pumps exhausts, temp/humidity sensor then conditionally turn on/off exhausts etc. Will be adding co2 soon. Its excellent software and if you know linux commands and some basic python will save you time.

The latest versions are more user friendly.

Gonna test it on my next plant which is in soil as we speak, it has not gotten first true leaves yet so perfect timing. THX

Liking the XP look of the screenshots.