RRDweather
This tiny project lived on between 2006 and 2009 and can still be found in the Ubuntu packages!
I was learning about RRD, programming languages like PHP and Perl, source control with Subversion and decided to release the (very limited) code on my website. Github did not exist at the time!
At some point code lived on Google Code: https://code.google.com/archive/p/rrdweather/
At its peak there were probably 20 instances of RRDweather that I could find. I remember instances in Finland, Germany, Switzerland and even Greenland!
That was pretty cool and probably a defining moment that made me embrace Open Source.
Sources can still be found on Github at https://github.com/sebw/rrdweather
You can download version 0.43 from 2009 here.
Since then, Lionel has picked up and maintained the Ubuntu package. The package can be found here.
Screenshot (version 0.44, can't find the release anymore):
