Source Sans System Font Replacement for Yosemite
If you're not crazy about using Helvetica for your UI, this is an easy way to change it to something more suitable. After looking for a bit for alternatives, I found Source Sans to be a very good alternative, closer to Lucida Grande, and with a wide range of weights.
Warning: This package has not been extensively tested. It works in my system without problems, but use at your own risk.
How it works
This does not hack or patch your OS in any way. It is a completely non-destructive way to replace the systemfont. It works by modifying the Source Sans font files to set their names to what Yosemite expects Helvetica to be. By placing them in your /library/fonts folder, they will be loaded before the actual Helvetica fonts. The original fonts are not modified or replaced.
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How to install
Download the font files
You can clone, fork, or download the repo from GitHub. Once you have the files, extract the font files (.ttf) to a temporary place.
Copy to your library
In a finder window, choose Go-->Go to folder and type in /Library/Fonts/. Copy the extracted files there. Note: you should copy to the root library and not the user library.
Log out & in
Log out and in from your user for the changes to take effect.
How to uninstall
Remove the SystemSourceSans* fonts from your /Library/Fonts folder. Log out & in again.
The Source Sans Family is licensed under the SIL Open Font Licence Version 1.1. The Open Font License is a free software license, and as such permits the fonts to be used, modified, and distributed freely (so long as the resulting fonts remain under the Open Font License).
#Questions? Comments? The font set was generated and is maintained by Kemie Guaida. It was only tested briefly. So far only minor bugs were discovered, so if you find any, please open an issue.
If you have questions or suggestions, you can open an issue here at github, or ping me via twitter @kemie