No, it's not. Starting in macOS Sierra, hid the "Allow from Anywhere" option in System Preferences.
You can still allow unsigned apps, but you need to use a Terminal command:
sudo spctl --master-disable
If Gatekeeper is enabled, the binaries you're downloading must have been signed by a valid developer ID. IIRC binaries you compile yourself get whitelisted automatically.
No, it's not. Starting in macOS Sierra, hid the "Allow from Anywhere" option in System Preferences.
You can still allow unsigned apps, but you need to use a Terminal command:
Or you can whitelist individual apps by option-clicking them and selecting "open", but that's purposefully obtuse.