A full suite of accurate and very powerful navigational tools. And I believe they are all free. (I have all of them installed, so Google
doesn't show me.) I highly recommend them. [Full disclosure: I am acquainted
with the author through NavList - but am in no way affiliated with him or his apps.]
Personally, my go-to for quick almanac data is Celestial by Navimatics. IIRC, it costs around US$10, but I think it's worth it.
*** I was going to post a link to Celestial, but it seems to have disappeared from the Play store. (!?) ***