PDF Editors:

WonderShare: https://pdf.wondershare.net/ad/pdf-editor/?gclid=CjwKCAjw586hBhBrEiwAQYEnHUFJCMhwR4mRJhUcAMY0TGm4fzeBIZdX9GJshUMd4mc_QVbfH3FJ_RoCm8MQAvD_BwE

LuminPDF (works with Google Suite): https://www.luminpdf.com/?utm_term=lumin%20pdf%20editor&utm_campaign=Pillar+/+Leads+/+GDN+/+march+2021&utm_source=adwords&utm_medium=ppc&hsa_acc=8339241823&hsa_cam=12761404745&hsa_grp=121113600716&hsa_ad=615451711146&hsa_src=g&hsa_tgt=kwd-382356682973&hsa_kw=lumin%20pdf%20editor&hsa_mt=p&hsa_net=adwords&hsa_ver=3&gclid=CjwKCAjw586hBhBrEiwAQYEnHedJ2CC-3cWnvFCR-diOeVKWsCMqOuL8Izdm7eAoLxJeyY6a6NMnERoCC4YQAvD_BwE

Dochub: https://dochub.com/

GeniusScan (great for taking photos of and emailing music)

Tuning Apps:

Cleartune

Tuner by plusadd

TonalEnergy

Tunable (come with additional features)

Practice+ (comes with additional features)

Tuner+

Metronome Apps:

Modern Metronome

7Metronome

https://www.imusic-school.com/en/tools/online-metronome/ (this is online in a web browser. I love it because it's very customizable and also has a tempo chart right on the page)