Day One - A simple journal application for the Mac, iPhone, and iPad. AboutTo learn more about Day One, see these two excellent reviews . PublishPublish is not available in Day One 2.
draw.io - Online diagramming application
Reminisce Journal - Reminisce Journal is a free iOS and Android app that helps you to capture live moments, daily activities, thoughts, ideas and travel logs, etc.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Momento - Momento is a unique diary/journal writing app for iPhone & iPod touch, which provides a quick...
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.