Fonts Index 

Apple's built in Font Book on 10.3 or later is an excellent tool and will serve most of the Mac users out there. You should learn to use it before looking to install other Font managers. 

dfontifier 2.0.1 Free  Convert between .dfonts and TrueType fonts.
http://homepage.mac.com/mdouma46/dfont/dfont.html
REQUIREMENTS Mac OS X 10.3.4 or later.
Convert between .dfonts and TrueType fonts. dfontifier is an application that can convert Datafork TrueType fonts (.dfonts) into ordinary OS 9-style TrueType fonts and vice versa. This may be useful when sending jobs to service bureaus that are still in OS 9. Also, while most current font manager applications can "bridge the gap" between the OS X native and Classic environments by making fonts you've activated available to both environments, they seem to be limited when it comes to data fork-based fonts. For example, your font manager can't make your .dfont fonts available to Classic because Classic doesn't understand how to use them. dfontifier can help solve this problem by allowing you to convert your .dfonts into regular resource fork-based TT fonts. That way, you can be certain you're using the exact same font set both natively and in the Classic environment.  

FontParade 1.1.1 Free Print a list of your fonts.
http://www.brightpebbles.org/fontparade
Requirements: Mac OS 10.2 or later
FontParade prints a simple list of your fonts.

FontThing 1.4.7 demo Preview/install fonts and more.
piDog Software, jim@pidog.com, www.pidog.com
Requirements: Mac OS 10.1 or later
Preview and install fonts with ease. Double-click a font in any location to preview, install, or temporarily activate and deactivate. Allows you to use fonts in documents that are not installed in your fonts folder. Create font catalogs with drag and drop ease.

Linotype FontExplorer X 1.2.3  Free Font management software.
http://www.fontexplorerx.com/pro/
Requirements: Mac OS 10.3.9 or later (Pro version available on website)
FontExplorer X sets a new standard for font management software. After several relatively sad years for all font users who were looking for a professional font manager, Linotype is pleased to fill the gap with the new FontExplorer X. Font management has never been so simple, and font sorting, font shopping and font discovery are now more fun than ever. FontExplorer X gives computer users all the font functions they could need, and lets them decide how deeply they wish to dive into various font themes. The "Clean System Fonts Folder" function now also takes care of those fonts that are part of the System installation of Mac OS X 10.5.

PopChar X 4.3 Shareware $38.99 Floating window shows available font characters.
http://www.ergonis.com/products/popcharx/
Requirements: Mac OS X 10.4 or higher, Version 1.6 for Mac OS 9 available here.
PopChar X is a floating window where you can click on a little "P" box to display a table of available characters for a particular font. Select the desired character and it instantly appears in your document. No more Key Caps, no more memorizing keystrokes. OS9 version still available from website. 

TrueBlue - 3.4  Free  Convert fonts into PostScript Type 1 format.
http://www.stone.com/TrueBlue/
Requirements: Mac OS X 10.2 or higher
TrueBlue is a free font conversion utility that converts True Type fonts (TTF) to PostScript Type 1 fonts (PS).  PS Fonts are required by Stone Design's PStill - the low cost alternative PS/EPS to PDF (aka Acrobat?) writer. PStill allows you to automatically view and incorporate legacy EPS, Freehand, Illustrator and PS files as PDF on Mac OS X.  TrueBlue provides a one-click interface to install fonts into PStill.  PDF, the Portable Document Format, is the lengua franca of Mac OS X. No matter how you scale, skew, rotate, flip, mask, annotate your PDF, you will get perfectly crisp output at any resolution on any platform. 

XChar (OS X) 3.01 Shareware $10  Type with all of the weird key-combo characters.
Ziksw.com, ascicolone@mac.com, http://www.ziksw.com/
Requirements: Mac OS X 10 or higher
XChar allows you to quickly use uncommon characters even if you don't remember the key combination you need to use a certain character. How? XChar displays a window containing all the characters that your Mac can display. When you need one of it, simply drag and drop it on the place where you need it. And when you don't need XChar, you can reduce its window to a small icon and place it where you want on your screen. When you'll need it again, simply click on it and it will zoom again. Moreover, XChar is a standalone application.