The Flipper Zero basically is a battery-powered microcontroller (STM32WB55RG)
with radio-frequency (RF) transceivers (Sub-GHz, NFC, RFID, Bluetooth) and
an infrared (IR) transceiver. It has a GPIO port and a USB port.

The community around Flipper creates apps to analyze various RF and IR signals.

Recommended Apps

Good Flipper Application Files (FAPs)

https://github.com/flipperdevices/flipperzero-good-faps

Mouse Jiggler

https://lab.flipper.net/apps/mouse_jiggler
https://github.com/DavidBerdik/flipper-mouse-jiggler

Spectrum Analyzer

https://lab.flipper.net/apps/spectrum_analyzer
https://github.com/xMasterX/all-the-plugins/tree/dev/base_pack/spectrum_analyzer

Recorded Signals

Infrared (IR) signals

https://github.com/Lucaslhm/Flipper-IRDB

Sub-GHz signals

https://github.com/UberGuidoZ/Flipper/tree/main/Sub-GHz

External Links

Flipper Zero

https://flipper.net/

qFlipper

https://docs.flipper.net/zero/qflipper

Official Flipper Zero App Store

https://lab.flipper.net/apps