Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Open Camera - Open Camera is an open-source camera app for Android phones and tablets.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Secure Camera - Modern camera app focused on privacy and security with QR & barcode scanning.
LightShot - The fastest way to take a customizable screenshot.
PhotonCamera - Android Camera that uses enhanced image processing.