Install the Alcatraz (http://alcatraz.io) package manager to get these.
https://github.com/neonichu/BBUFullIssueNavigator
Shows the whole error/warning in the issue navigator instead of a single line.
https://github.com/yuhua-chen/MCLog
Allows you to filter the console by a regular expression.
https://github.com/markohlebar/Peckham
Add imports from anywhere in the code base - press Cmd+Ctrl+P to pop up a window which has autocompletion for your headers.
https://github.com/onevcat/VVDocumenter-Xcode
Fill in a quick documentation template.
https://github.com/kinwahlai/XcodeRefactoringPlus
Additional refactoring tools. Still not as full-featured as some IDEs but it's a case where every little helps.