Welcome to iMore (love that phone wanted to autocorrect that to unite), as far as apps
1Password
Twitteriffic 5 or Tweetbot 3
iMore App
Tapatalk
Fantastical
Sleep Cycle Alarm Clock and Power Nap
Vert (for those of us that can't convert to save our lives)
Mailbox and Boxer are great Mail.app replacements
Sent from my iPhone using Tapatalk