Calculator of functions derivatives.
Samsung Global Goals Samsung Electronics Co., Ltd.
Google Classroom Google LLC
Duolingo: language lessons Duolingo
U Dictionary Translator Talent Education Inc
Cake - Learn English & Korean Cake Corp.
Miga World - Miga Town: My World XiHe Digital (GuangZhou) Technology Co., Ltd.
Babbel - Learn Languages Babbel
Kahoot Play & Create Quizzes Kahoot!
Simply Piano: Learn Piano Fast Simply (formerly JoyTunes)
