Tweedle App - Notion is nice but sometimes all you need is an app like Tweedle.
Winds - Open source & beautiful RSS reader
Plume - App for writing documents, scripts, books and more.
Cappuccino - Cappuccino is a framework which makes it easy to create advanced web apps.
Tweetbot - Sync your timeline across your iPhone, iPad, and Mac. Mute tweets by user, hashtag, tweet source, or keywords (including regex). 3rd Party support for image, video, read later, and timeline sync services.
Feedly - The content you need to accelerate your research, marketing, and sales.