Has region-locked Sub-GHz transmission because of legal limitations.
Has no ability to save and send rolling codes (dynamic encrypted) in Sub-GHz, only shows them in captured list.
Factory-set device name that shows everywhere (Bluetooth broadcast, USB connection, etc) that cannot be changed.

The Flipper team has a list of device names with their corresponding production information (No shipping address) so they can assist you easier in case of an RMA.

🔓 Unleashed `DarkFlippers/unleashed-firmware`

(AKA Code Grabber firmware.)
Very active development and Discord community.
Removes Sub-GHz regional transmission restrictions by default.
Allows Sub-GHz extended frequency range (i.e. restaurant pagers) through dangerous_settings file.
Adds extra Sub-GHz frequencies by default through Official setting_user file.
Adds extra Mifare classic keys to included dict file and leaves user file untouched.
Can be used to capture and send dynamic encrypted protocols/rolling codes. (Modern garage doors, etc.)
Encrypted Sub-GHz signals and codes can be added manually.
Current modified and new Sub-GHz protocols list can be found here.
Comes with extra apps and plugins from the general community through SD Application loader (FAP files).
- More details and full list of changes can be found in their README.

💫 RogueMaster `RogueMaster/flipperzero-firmware-wPlugins`

Built off Unleashed as the base firmware (which is a fork of Official dev firmware.)
Removes Sub-GHz regional transmission restrictions after changes to extend_range.txt file.
Allows Sub-GHz extended frequency range (i.e. restaurant pagers) through extend_range.txt file.
Has Sub-GHz protocols and most of the other changes taken from Unleashed FW (see changes).
Adds extra custom assets (Mifare classic dict, example files, etc).
Includes some PRs from Official firmware that are not yet merged in Official firmware (bleeding edge).
Includes experimental "Games Only Mode" (aka Dumb Mode).
Includes an enhanced, but experimental, new "Dolphin Level" system.
Includes extra apps and plugins from the general community through SD Application loader (FAP files).
Also includes a number of other small tweaks, changes, and a ton of additional animations.

Built from RogueMaster (converted to fork of Official for future development).
Removes Sub-GHz regional transmission restrictions after changes to extend_range.txt file.
Allows Sub-GHz extended frequency range (i.e. restaurant pagers) through extend_range.txt file.
Has Sub-GHz protocols and most of the other changes taken from Unleashed FW (see changes).
Adds extra custom assets (Mifare classic dict, 18+ animations, example files, etc).
Includes an enhanced/improved "Dolphin Level" system similar to RogueMaster.
Includes extra apps and plugins from the general community through SD Application loader (FAP files).
Also includes a number of other small tweaks, changes, and stability fixes.

Fork of Clara Crazy's Xtreme FW (converted to fork of Unleashed for future development).
Adds custom-themed graphics and some extra features that are not included in the Official Firmware.
Removes Sub-GHz regional transmission restrictions after changes to extend_range.txt file.
Allows Sub-GHz extended frequency range (i.e. restaurant pagers) through extend_range.txt file.
Has Sub-GHz protocols and most of the other changes taken from Unleashed FW (see changes).
Adds extra custom assets (Mifare classic dict, 18+ animations, example files, etc).
Includes extra apps and plugins from the general community through SD Application loader (FAP files).

Supports different keyboard layouts for Duckyscripts via the script keyword DUCKY_LANG.
Out of date with upstream Unleashed firmware, appears to not be maintained.
Includes some integrated community plugins & games but not updated FAP loader.

The dev branch is intended for public use, while others are either testing or archived hackathon submissions.
Cracking T5577 RFID passwords via dictionary attack.
Desktop header branding [WTX].
Has some frequently updated interesting experimental stuff in different branches.

Staying up to date with upstream (official) firmware is important.
TX restriction removal is illegal in most circumstances, use at your own risk.
MuddledBox was the first popular firmware fork, but didn't grow up.
Unleashed is more focused on core functionality, stability, and Sub-GHz protocols.
RogueMaster is more focused on visual tweaks, new items, and changes (some experimental).
RogueMaster is based on Unleashed, but may be less stable than Unleashed in some circumstances.