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Music For Makers - Licensing good music has never been this easy.
NoTex - Online Text Editor for Math Formulas (open source)
TunePocket - Download 11,000+ royalty free music tracks and sound FX. Buy once, use forever. New music added daily. Save over 50% compared to most popular similar services. Incredible value!
RemNote - All-in-One Tool For Thinking & Learning
Incompetech - Royalty Free and Creative Commons Music Archive