The BetterFonts mod adds OpenType font support for Minecraft. This mod will use the fonts installed on your system for drawing text instead of the builtin bitmap fonts that come with Minecraft. Languages such as Arabic and Hindi look much better with this mod since both require complex layout that the bitmap fonts simply can't provide. All in-game text will change to use the new fonts including GUIs, the F3 debug screen, chat, and even signs. This mod should have little or no impact on performance.
Forum
For more information and discussions, see the Forum.
Installation
Installation is the same as for any other client mod. Extract the contents of the downloaded .zip file into your minecraft.jar, and make sure to delete the META-INF folder inside minecraft.jar. This mod is compatible with OptiFine, but make sure to install it after OptiFine.
Configuration
You can have a config file to change the default font and text size this mod uses. If your game is installed in a ".minecraft" directory, then the config file will be ".minecraft/config/BetterFonts.cfg". See the Forum or the Files section for an example config file.
Source Code
The source code is available in a GitHub repository and is licensed under the LGPL.