Apple - Source for all things Apple
MacUpdate -The latest applications and updates without malware
Microsoft -Source for Microsoft products like Office and SilverLight
Adobe - Source for Adobe products and updates
Other World Computing - Source for Mac specific upgrades power supply replacements, used Apple Computers, batteries, and peripherals
MacTracker - Database of all Apple products manufactured, includes newest OS you can run, maximum memory, and available drive space from the factory.
Data Memory Systems - Supplier of memory, replacement drives, USB/CSD flash drives/cards
iFixit - Source for parts and repair guide
Current versions of applications:
Firefox - 75.0.0 - Speedy and secure
Office 2011 - 14.7.7 (Update) (Office 2011 is NOT 64 bit)
Office 2016 - 16.16.20 (available through Microsoft updates with the application)
Adobe Reader DC - 19.021.20047
Adobe Flash Player - 184.108.40.2064
Java - Version 8 Update 241
Available through your updates at the App Store: iTunes 12.8.x, Apple Updates for 10.10.x, 10.11.x,10.12.x, 10.13.x, 10.14.X, and 10.15.x, Apple Safari 9.11, 10.0.13, and 11.0.1, 13.0.5 and for your iOS device 12.4.1 or 13.3.