A simple Mac OS X desktop version of the excellent Nirvana GTD task-list web app. All it does is open focus.nirvanahq.com in a WebView and remember your login (specifically, Nirvana's auth token — this app does nothing with passwords, Keychain, etc.).
Note I have no affiliation with People Like Us, the makers of Nirvana!
I think of Nirvana as an app, and it's an excellent single-page web app. I wanted to be able to quickly get to it via command-tab instead of finding the tab in my browser.
Download the latest release, open the zip file, and drag Nirvana.app into your Applications folder.
Since this app isn't signed, you'll have to go into System Preferences > Security & Privacy > General and choose "Allow apps downloaded from Anywhere" (click the lock in the bottom-left and enter your password first).
MIT License
Copyright (c) 2016 Kevin Cox
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.