Another note: The user who posted this link created his account 21 days ago, and already has 51 submissions, most related to similar topics. Unsurprising, given the details on the site linked from his profile page.
My big project is OpenTRV which has the modest aim of cutting the UK's entire carbon footprint by 10% (and/or Europe'ss by 8%) at low cost by halving space heating costs especially for homes in a simple and fiddle-free way!