iDailyDiary Free is a program tailored for taking daily notes, creating a journal, putting your thoughts into writing etc. The documents you create are encrypted and require a password to access. The built-in editor supports graphics, hypertext links and links to other diary pages. iDailyDiary is fully searchable so you can track down important dates and reminders. You can also export your diary to HTML web pages.
A “pro” version is available with additional features including spell checker, thesaurus, topics (group related entries), themes support (50+ themes included), tables, etc.