Camscanner alternatives
1) Adobe Scan

With Adobe scan you can turn anything — receipts, notes, documents, photos, business cards, whiteboards — into an Adobe PDF with content you can reuse from each PDF and photo scan.
Updated: June 18, 2020
In App purchase: Yes
2) Photo scan by Google

This is another great product from google that can scan your documents as well as your old photos to save them as digital copies
Updated: April 26, 2019
In App purchase: No
3) Turbo scan

TurboScan turns your phone into a full-featured and powerful multipage scanner for documents, receipts, notes, whiteboards, photos, or other everyday text.
Updated: May 15, 2020
In App purchase: Yes One time
Shareit alternatives
1) Files by Google

Google’s own file manager with a bunch of great features allows you to not only share your files using WiFi as well as helps to clean the clutter from your phone all in one great app to manage your phone storage and sharing without WiFi or Mobile data.
Updated on: June 29, 2020
In App purchases: No
2) Zapya

Zapya is also a great alternative for shareit. Just like shareit Zapya also supports cross-platform file sharing
Updated: June 5, 2020
In App purchase: Yes
3) SuperBeam

SuperBeam 5.0 is the easiest, fastest, and most secure way to share large files between your devices using WiFi direct. Devices can be paired using QR codes (with the included QR code scanner), NFC, or manual sharing key.
Updated on: February 21, 2020
In App purchases: Yes