UnicodeChecker displays information for every code point from the Unicode Standard 5. For a given number, UnicodeChecker will display that character along with its UTF-8, UTF-16 and UTF-32 encodings, XHTML entity, Unicode Name, mapping information and much more.
There are also several text conversion functions available to all applications from the ‘Services’ menu or via AppleScript. So you can convert text to and from XHTML/HTML character entities or have UnicodeChecker escape Unicode characters for use in CSS or other languages.