I have been quite active in Wikipedia recently...Here's just a few pages I've contributed to in a small way.
Reliability engineering
Tessellation
Robert Murray M'Cheyne
List of open source software packages
Riemann hypothesis
Surface-mount technology
Rhyming dictionary
Protestant Reformers
Donatist
William Huskisson
The Ilston Book
Sacralism
Generalized extreme value distribution
CICCU
Robert Anderson (theologian)
That's enough to give the flavour of some of my interests, in engineering, theology, maths, history, etc.
