Clover Diary is simple diary software. But it provides basic functions to write a diary like calendar view, password protection and so on.
Diary is a simple daily journal application. Start it up, type what you did today, quit. Next day, same thing. Searchable, but no bells and whistles;
Geburtstag' is German for 'Birthday' which makes GeburtstagsChecker an application that checks for upcoming birthdays and reminds you of them to avoid potential embarrassment if your memory is rather weak.
(commercial) Journal eXpress is a personal diary, event manager, personal address book, weather forecasting tool, todo list and more.
MacJournal is a virtual journal or blog. The latest release is now commercial software.
OCRemind keeps track of events for you. When it's the day an event happens, the icon in the menubar will turn from an R to a *. Click the star and the event is shown.
SyncMate is an easy-to-use handy synchronizer that will help you keep all your private notes, documents, contacts, and other files organized. It can form a quick connection between your Mac and your Pocket PC. SyncMate allows you to synchronize via USB cable with such applications as Bookmarks, Address Book, Stickies, iCal, iTunes, iPhoto, and others. SyncMate lets you receive, read, and manage your text messages, read your device status, install applications to your mobile device, synchronize time, and follow all file exchanges using the operation log.
Tagebuch is a simple, clean, easy to use portable diary.