Merge pull request thibmaek#214 from gitbls/patch-1

Add ndm, pistrong, and sdm to Tools section

Author: thibmaek

README.md

@@ -106,13 +106,15 @@ The complete collection of (consumer) Raspberry Pi models consist of:
 - [Hardened Kernel Builder for RPi](https://github.com/tschaffter/raspberry-pi-kernel-hardened) - Cross-compile the Linux kernel for Raspberry Pi with enhanced security using a single command.
 - [HealthyPi](https://github.com/Protocentral/protocentral-healthypi-v3) - HAT which includes vital health monitoring like ECG, respiration, pulse oximetry and optional blood pressure & body temperature sensing. ![Supports Raspberry Pi 2+](/media/badges/rpi-2+.png)
 - [iotwifi](https://github.com/cjimti/iotwifi) - Wifi AP + Client management in 8MB [Docker Container](https://hub.docker.com/r/cjimti/iotwifi/), with REST API for controlling wifi client and station modes simultaneously. ![Supports Raspberry Pi 3](/media/badges/rpi-3.png)
+- [ndm](https://github.com/gitbls/ndm) - Command line tool to easily manage DNS and DHCP servers.
 - [OpenVPN-Setup](https://github.com/StarshipEngineer/OpenVPN-Setup) - Shell script to set up Raspberry Pi as an OpenVPN server.
 - [Orangetool](https://github.com/Moduland/Orangetool) - Control functions for Single-Board computers in Python.
 - [pi-gen](https://github.com/RPi-Distro/pi-gen) - Tool used to create the raspberrypi.org Raspbian images. This can be used to create your own custom images with specific packages installed, etc.
 - [PiBakery](http://www.pibakery.org/) - The blocks based, easy to use setup tool for Raspberry Pi.
 - [Pieman](https://github.com/tolstoyevsky/pieman) - Script for creating custom images based on Raspbian, Devuan, Ubuntu and Alpine Linux.
 - [Pimod](https://github.com/Nature40/pimod) - Reconfigure Raspberry Pi images with an easy, Docker-like configuration file.
 - [PiShrink](https://github.com/Drewsif/PiShrink/) - Bash script that automatically shrinks a pi image that will then resize to the max size of the SD card on boot.
+- [pistrong](https://github.com/gitbls/pistrong) - Manage certificate-secured strongSwan VPNs. Installer and command-line tool for client-server, site-to-site, and host-to-host VPNs.
 - [PiVPN](https://pivpn.io) - Create a full-featured OpenVPN/WireGuard VPN Server with a single bash command.
 - [Pi-Apps](https://github.com/Botspot/pi-apps) - The most popular app store for Raspberry Pi computers, 100% open-source bash scripts.
 - [Processing](https://pi.processing.org/get-started/) - Processing Development Environment running on Raspberry Pi.
@@ -121,6 +123,7 @@ The complete collection of (consumer) Raspberry Pi models consist of:
 - [Raspberry Pi Imager](https://www.raspberrypi.org/blog/raspberry-pi-imager-imaging-utility/) - An easy way to install Raspberry Pi OS and other operating systems to an SD card ready to use with your Raspberry Pi
 - [Raspbian QEMU with network](https://ownyourbits.com/2017/02/06/raspbian-on-qemu-with-network-access/) - Simple tool to launch QEMU on Raspbian with the required modifications on the system and kernel. Automatic network access. Handy to create images in your PC.
 - [Resin Bridge](https://github.com/resin-io-playground/resin-bridge) - Simple application/repo to bridge a Raspberry Pi's wlan0 interface to devices plugged into it over ethernet (eth0).
+- [sdm](https://github.com/gitbls/sdm) - Easily and fully customize RasPiOS images. Install apps, configure settings, etc then burn SSDs/SD cards for lots of different systems from a single image, and each one boots up fully configured and ready for work. Or play.
 - [stressberry](https://github.com/nschloe/stressberry) - Stress test your Raspberry Pi and plot temperatures.
 - [TorTiPi](https://github.com/r0hi7/tortipi) - Shell script to automate the task of converting Raspberry Pi into a tor based wifi hotspot.
 - [WebStation SYSMON](https://github.com/t0xic0der/sysmon) - An intuitive remotely-accessible system performance monitoring and task management tool for servers  and headless Raspberry Pi setups.