RedNotebook is a modern journal

It includes a calendar navigation, customizable templates, export functionality and word clouds. You can also format, tag and search your entries. Add pictures. RedNotebook is Free Software under the GPL. (Source: RedNotebook.)

It is a fast, simple clutter free, daily diary with search and cloud of tags. Indispensable for me. Now it can be installed from apt-get with following command on the terminal

sudo apt-get install rednotebook

Worth giving a try.