1. Codepilot – free Xcode plugin for quickly searching through project
    Link: http://codepilot.cc/

    Codepilot - free Xcode plugin to search through project
    Codepilot enables easy high-speed keyword searching through your entire Xcode project. What it does is enhance Xcode by adding swift navigation through files and other parts of your project, integrate seamlessly with your IDE.
    It also sorts by relevance and highlights search keyword so you can quickly find exactly what you’re looking at. 


  2. ColorSense – free Xcode plugin which shows color picker right in code
    Link: https://github.com/omz/Colorsense-for-Xcode
    ColorSense - free Xcode plugin to show color picker in code

    With this plugin you can select UIColor code in Xcode and see the exact color or even adjust the color using the color picker.

  3. KSImageNamed – free Xcode plugin that provides autocomplete for imageNamed code
    Link: https://github.com/ksuther/KSImageNamed-Xcode
    KSImageNAmed - Xcode plug-in that provides autocomplete for imageNamed code
    KSImageNamed xCode plugin provides auto-completion for image name entries when using [UIImage imageNamed:] by scanning through the files within workspace. 


  4. StringSense – free Xcode plugin to make working with strings easier
    Link: https://github.com/holtwick/HOStringSense-for-Xcode

    StringSense - free Xcode plugin to work with strings
    StringSense allows to edit unescaped version string in small popup when selecting a string. 


  5. XcodeColor – free Xcode plugin which allows to use colors in the Xcode debugging console
    Link: https://github.com/robbiehanson/XcodeColors

    XcodeColors - free Xcode plugin which allows to use colors in the Xcode debugging console
    XcodeColors allows you to use colors in the Xcode debugging console. It’s designed to aid in the debugging process. For example:
    • Make error messages stand out by printing them out in red.
    • Use different colors for logically separate parts of your code.

    You can specify, in your source code, the exact RGB values you’d like to use for foreground and/or background colors.


  6. Xcode 4 fixins – set of free Xcode plugins
    Link: https://github.com/davekeck/Xcode-4-Fixins

    Really this plugin consists of several plugins:
    • CurrentLineHighlighter: This fixin highlights the line currently being edited in the source editor, making it easier to track the current insertion point. This fixin adds a “Current Line Highlight Color…” menu item to the Editor menu to set the highlight color.
    • DisableAnimations: This fixin disables Xcode’s various NSAnimation-based animations, such as the Show/Hide Debug Area, Show/Hide Navigator, and Show/Hide Utilities animations.
    • FindFix: By default, when Xcode’s inline find bar opens, it doesn’t display any options to customize searching. This fixin makes Xcode show all find options (such as “Ignore Case”) in the find bar when it opens. This fixin also makes text-replacement the default mode in the inline find bar, giving immediate access to the “Replace” and “Replace All” buttons.
    • HideDistractions: This fixin adds a “Hide Distractions” menu item to the View menu, which focuses the current editor by hiding auxiliary views and maximizing the active window. This fixin works best when the XCFixin_DisableAnimations fixin is also installed.
    • InhibitTabNextPlaceholder: This fixin disables using the tab key to select between argument placeholders of a synthesized (by Xcode’s code completion) method call. Xcode’s default tab functionality can be annoying if you’ve synthesized a method invocation and attempt to indent something nearby before filling-in the argument placeholders; in such a case, Xcode jumps to the nearest argument placeholder instead of indenting. This fixin does not affect the “Jump to Next Placeholder” key binding in the Xcode preferences.
    • TabAcceptsCompletion: Upon pressing tab, this fixin makes Xcode accept the currently-highlighted completion suggestion in the popup list. (Xcode’s default tab behavior accepts only as much of the highlighted completion that is common amongst other suggestions.)


  7. MiniXcode – free Xcode plugin plugin for anyone who likes to work without the large Xcode toolbar
    Link:  https://github.com/omz/MiniXcode

    MiniXcode - free Xcode plugin plugin for anyone who likes to work without the large Xcode toolbar
    MiniXcode plugin provides a popup menu at the top of the window for scheme and device selection, and also adds keyboard shortcuts for scheme and device selection.