Modern desktop diary and personal journaling tool. It lets you format, tag and search your entries. You can also add pictures, links and customisable templates, spell check your notes, and export to plain text, HTML, LaTeX or PDF.
Using it for 10 years now. One of the most effective and reliable notebook software. Recommend it 100%.
Simple and functional with little "noise" that a lot of journaling apps have. Supports markdown as well which is a bonus!