Google open sourced 750 glyphicons few days ago so you can download them and use them freely in your apps. They come in several formats to choose:

• SVG versions of all icons in both 24px and 48px flavours
• SVG and CSS sprites of all icons
• 1x, 2x icons targeted at the Web (PNG)
• 1x, 2x, 3x icons targeted at iOS (PNG)
• Hi-dpi versions of all icons (hdpi, mdpi, xhdpi, xxhdpi, xxxhdpi) (PNG)

You can preview them here or download this zip.