This is my most recent obsession. I'm sure that many of you have already heard of IF this THEN that. But for you noobs out there, I'm starting a thread. If this then that creates actions based on events. For instance, if the weather is going to be crummy tomorrow morning when I wake up at 5am, I want a push message to let me know. Why? Because at 5am I'm too groggy to remmeber to check the weather until I walk outside... and get soaked in rain. Dumb example, but you get it.
Now, you can always program something... but if this then that is about 10x easier, and you don't have to worry about running the program 24/7.
Do you ever need to post website updates to Twitter/Facebook? Do you ever check eBay, Bestbuy, Nike, for product changes? Do you regularly check craigslist? Do you need to auto shorten urls to Bit.ly?
Instead of doing these things, you can automate them. Through a nice online control panel.
IFTTT has a collection of pre-made recipes so you don't even have to set them up.
Your recipe will run every 15 minutes. So, this isn't instant, but its free. I wouldn't use it for anything that needs to be instant (like auto-buying for price changes), but its perfect for other stuff.
Similar services: The best apps. Better together. - Zapier - Zapier (free but limited number of tasks)
Hybrid Integration Platform - elastic.io (paid)