Zabbix - Track, record, alert and visualize performance and availability of IT resources
Tweedle App - Notion is nice but sometimes all you need is an app like Tweedle.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Plume - App for writing documents, scripts, books and more.
Prometheus - An open-source systems monitoring and alerting toolkit.
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.