Rusty Brick makes a lot of grey apps and if you were not aware of it, many of these support the observance of Jewish prayers and rituals. I use their app for counting the Omer and toting around an entire siddur (in HD). They are developing new apps all the time.

This is a fantastic site for Jewish texts. TaNaKh, Mishnah, Gemara, Mishneh Torah are all available hear. Good for research or simply copying and pasting required verses from our traditional texts. I use this one weekly.

Yes, I know the content leans to the right, but these videos are so well done and so clever. You can back up the URL to the main site to see lessons for adults as well. The content is very thorough. My teacher of Hilchot Bikur Cholim v'Avelut comes in once a month with a clever video to show the class.