I am looking a sort of a day organiser for my Ubuntu laptop with Google calendar integration and preferably cross-platform so I could use it on my Android phone. Basically I need a to-do-list with an option to track the progress, a nice visualisation of the day, ability to see my Google calendar events and appointments. I wonder if anything like this exists. Any recommendations are welcome!
From my personal experience I can recommend GNOME Evolution. You can install it as usual:
sudo apt-get install evolution evolution-plugins
It has Mail, Contacts, Calendar, Tasks and Memos.
Calendar works normally with Google Calendar. Not sure about Tasks.
KOrganizer from KDE may help too. I did not tried it.
sudo apt-get install korganizer
If you need only calendar you can start with GNOME Calendar:
sudo apt-get install gnome-calendar
You can try OrgMode as productivity platform too. But it is terminal based.