Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
Singscope - See your pitch analyzed as you sing
TeXworks - The TeXworks project is an effort to build a simple TeX front-end program (working environment)...
Vocalist - Vocalist is an all-in-one music utility.
Archimedes - Archimedes is a LaTeX and Markdown editor designed to make mathematical writing easy.
Vibely - Crush your goals together with Makers