Development

aLogcat
View system and app log

SysLog
Capture log files

Rtl-sdr driver
Allows you to use I/Q packet source in your Android applications.
Exploitation

Rucky
Modern looking USB Rubber Ducky Editor and Attack Launcher

Router Keygen
Recover your keys for your wifi network

cSploit
The most complete and advanced IT security professional toolkit on Android
Information Gathering
NetHunter

Hacker's Keyboard
The ultimate virtual keyboard for hackers

Nexmon
Install a WiFi firmware that enables monitor mode and frame injection on support

NetHunter VNC
GUI desktop experience for Kali Linux on Android
Privacy

PixelKnot
Hide Messages

Orbot
Proxy with Tor

OONI Probe
Open Observatory of Network Interference (OONI)
RF

LTE Discovery
Powerful signal discovery and analysis tool

RF Analyzer
RF spectrum visualizer for HackRF/RTL-SDR

Walrus
Use your existing contactless card cloning devices with your Android device

Rtl-sdr driver
Allows you to use I/Q packet source in your Android applications.
Sniffing & Spoofing

cSploit
The most complete and advanced IT security professional toolkit on Android

Intercepter-NG
Multifunctional network toolkit
System

aLogcat
View system and app log

Opaque
Secure, open source Opaque oVirt, RHEV, and Proxmox client

NetHunter VNC
GUI desktop experience for Kali Linux on Android
USB HID

Rucky
Modern looking USB Rubber Ducky Editor and Attack Launcher

WHID Injector
WHID Mobile Connector

USB Keyboard
Android device as USB keyboard/mouse
USB Misc
Utilities

Hacker's Keyboard
The ultimate virtual keyboard for hackers

Opaque
Secure, open source Opaque oVirt, RHEV, and Proxmox client

NetHunter Terminal
Kali Linux command line shell