I really like Brewer's Friend (brewersfriend.com.) It not only has great calculators (although I would still use Bru'n Water for water chemisty,) it also has linked iPhone and Android apps with timers to use while brewing. You can use it to build and/or search for recipes, store recipes, build brewday checklists, and record your brewday in a log. Finally, since it's web based, you can access your account from anywhere if you have an internet connection.