LaunchControl is a fully-featured launchd GUI allowing you to create, manage and debug system and user services on your Mac.

Little Snitch informs you whenever a program attempts to establish an outgoing Internet connection. You can allow or deny these connections, or define rules to handle future attempts automatically. Little Snitch reliably prevents your private data from being sent out to the Internet without your knowledge.

Mp3tag is a powerful and easy-to-use tool to edit metadata of audio files.

An elegant and powerful text editor that is easy to use.

Image browsing/slideshow application.

CloudMounter is a centralized service that allows mounting cloud storages as local drives and work with online files the same way as with local ones.

Convert any video to MP3 in one click.

Flexible flashcard application.

iReal Pro is the most popular music practice app.

Simplifies drag and drop between Spaces and fullscreen apps.

OnyX is a multifunction utility that you can use to verify the structure of the system files, to run miscellaneous maintenance and cleaning tasks, to configure parameters in the Finder, Dock, Safari, and some Apple applications, to delete caches, to remove certain problematic folders and files, to rebuild various databases and indexes, and more.

Secure file-sharing tool.

Outline for Mac is a simple yet powerful knowledge management app.

With coconutBattery you are always aware of your current battery health. It shows you live information about the battery quality in your Mac, iPhone and iPad.