Intervals - Project driven time tracking with customizable workflows and detailed, meaningful reports.
Day by Day Organizer - Time management app that combines Google Calendar and Google Tasks and enhances their features.
Rindle - Powerful workflow automation for professionals.
Calendar Lock PEA - Calendar Lock PEA is an encrypted desktop calendar with a day, week and month view. The shown calendars are never stored unencrypted on your disk, but exist only in the RAM. Platform-independent, Open Source, no installation or registration required.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Business Calendar - Powerful and easy to use calendar app for Android including weather, widgets and tasks.