macOS
Important Guides
osx-and-ios-security-awesome - macOS and iOS Security Related Tools
The above guides are good read and should be followed for a better hardening of macOS, however the OS is too stiff and proprietary so there's no way to disable "calling home" (Connecting with Apple servers) without breaking the device, to my knowledge.
FOSS App Indexes
Password Privacy / 2FA
Ente Auth - 2FA, All Platforms
Aegis - 2FA
Stratum - 2FA
KeePass or KeePassXC - Password Manager
Bitwarden - Password Manager
Proton Pass - Password Manager
Strongbox - Password Manager
DNS Adblocking
VPN
Mullvad VPN - Paid
IVPN - Paid
NYM - Paid
Antivirus
Safari Adblockers
Privacy / Security Tools
Lockdown Privacy - Block Trackers \& Ads
LuLu - Mac Firewall
SuspiciousPackage - Analyze PKG Files
LinkLiar - Spoof MAC Address
Kextviewr - View All Kernel Modules
What Route - Network Diagnostic Tool
Sloth - Process Manager
Hardware / System Monitors
Conky - Hardware / System Monitors
Colors - Hardware / System Monitors
eul - Hardware / System Monitors
Stats - Hardware / System Monitors
Mission Center - Hardware / System Monitors
MacFetch - Hardware / System Monitors
Hot - CPU Monitor
TaskExplorer - Task Manager / Viewer
Pearcleaner - System Cleanup; Uninstallers. Github
File Tools
PeaZip, The Unarchiver, unxip, Keka - File Archivers
Readdle - Multipurpose File Tool
OpenMTP - Mac / Android File Transfer Github
JDownloader - File Download Manager
Go Speed - File Download Manager; Extension; Plugins
FlyingCarpet - Cross-Platform AirDrop; Guide