I'm an office experience consultant at a fast growing, venture-funded startup that you've more than likely heard of. Right now I am managing the Caffeine Portfolio and am using arduinos at each coffee pot (http://www.deferredprocrastination.co.uk/blog/2013/coffeebot...) in order to monitor the quantity. I wired these up to a node.js backend which will take the quantities of each pot and check them against a threshold. I track and visualize these changes using CoffeeScript, d3.js and HTML5 canvas. If the coffee pot quantity is below a certain threshold, I have the node.js call out to our Rails-backed RESTful API which sends messages through our RabbitMQ setup to asynchronously dispatch a TaskRabbit so someone can come and fill it up.
Edit: I also a bit of Perl to glue it all together and store the stats in an MS Access cloudstore.
If you're planning to make a blog post of "which are the best technologies?", note that the answers here will be heavily biased and should not be used as an accurate indicator of popularity.
Day job? Sun 4 and Scientific Linux 4.5 (it's REAL painful).
Side project? LAMP + cPanel
Hobby projects? MEAN + Playing with docker & AWS. I'm pretty excited about Docker HUB as if I can get a firm grasp on it I might be able to convince my day job to abandon our current setup and go with a much faster AWS/EC2 setup.
I did, and it looks really cool! Probably not going to migrate either of these projects, in the short term, though. The first, because it would be a large undertaking; the other, because it does almost nothing with the database - all of one table, only a couple trivial selects, so my focus there is elsewhere for now. At some point I definitely plan to dig deeper into OpalEye, and might wind up porting one or both medium-to-long term. Though actually, if you want to scope things out and see how hard you think migration might be, that first project is Snowdrift.coop
Ubuntu, Apache HTTP Server and Nginx, Digital Ocean, Java, Freemarker, Firefox, WebKit, a slew of Apache Software Foundation projects, and numerous other open source projects.
Edit: I also a bit of Perl to glue it all together and store the stats in an MS Access cloudstore.