Notable
The developer couldn’t find a notes app that did everything he wanted, he made his own. Supports markdown, with notes stored on your computer, zen mode, and split view. Sync via third-party services such as Dropbox.
Latest free apps
Joplin
Open-source, cross-platform note-taking and to-do app organizes into notebooks. It supports markdown and can be synced with one of several cloud services. You can import from Evernote.
NetNewsWire
The venerable RSS feed reader is back with an open source version by Brent Simmons as his contribution to the open web. Features include a Safari extension for feed-adding, direct feed-downloading, and syncing via Feedbin.
Tiles
Easily organize your windows by dragging them to the edges of the screen, using keyboard shortcuts, or clicking on options in the menu bar.
Zotero
Designed as a way to collect, organize, cite, and share research, but could also be used as for notes. Organize with collections, tags and saved searches. Sync across devices or a web browser. Share and collaborate with as many people as you like.
BitBar
Put pretty much anything you want in your Mac’s menu bar, using extensible plug-ins — plenty of which have already been created.
Lightweight PDF
Compress PDFs by up to 90 per cent with a drag-and-drop interface that promises a balance between file size and quality. Protect your privacy by avoiding websites with similar functionality.
Synfig
Vector-based animation features layers and filters, a bone system for cut-out animation, and vector-tween — transform any vector shape into another.
LMMS
Create melodies and beats, synthesizing and mixing sounds, arranging samples and much more. The playback with a typing or MIDI keyboard. Bundled with ready-to-use content.
Duet
Turn an iPad into an extra display for your Mac using the Lightning or 30-pin cable.