Mac: You won't find a shortage of great plain text editors for Macs, but FoldingText brings a few new things to the table. These include Markdown-style auto formatting, an interesting text hiding mechanic, Applescript automation and more.
At its core, FoldingText is a pretty straightforward plain text editor. Underneath the hood are some neat features though. For instance, you can create a new header for a document simply by hitting the "#" sign. Underneath that, you can hit "-" to automatically create a to-do list box, or just type away a few lines. When your document gets long and out of control, you can click on the "#" sign to fold the text up so you don't have to look at it.
The folding makes organising big documents a lot easier, and navigation is simplified. You can also set up a Pomodoro style timer. FoldingText is less of a text editor than it is a text outliner, but fans of plain text editing should check it out. FoldingText is still in beta, and while it is you can try it out for free from the developers site below.