Ask HN: Tools of the Trade, 2016 edition

It's been over two years since the last solid Tools of the Trade and I'm sure a lot has changed. So which SaaS tools and services people are going to use in 2016 instead of hosting on their own?

Previous Threads: joshu's original 2010 thread: https://news.ycombinator.com/item?id=1769910 2013 edition: https://news.ycombinator.com/item?id=5235137 2014 edition: https://news.ycombinator.com/item?id=8028704