Meshtastic is a team of volunteers, and as such there are always plenty of ways to help. This project gets great contributions from people in their off hours. Those contributors work on the features they are interested in. It is a very open and welcoming developer community, and we are always looking for help to improve Meshtastic.
Most communication and interactions happen with protocol buffers. The [Meshtastic Protobuf Definitions](https://github.com/meshtastic/protobufs) repo is where all of the protocol buffer changes happen. See the [Protobuf API Reference](https://buf.build/meshtastic/protobufs/) for more details.
The [firmware repo](https://github.com/meshtastic/firmware) is where all of the device firmware development happens. This is where the code for the ESP32, nRF52 and RP2040 based devices is developed. It is mainly C and C++ code. Think Arduino. It is where the first level of hardware interaction begins and ends.
[Modules](/docs/configuration/module) extend device and mesh functionality beyond core functions. These are also implemented mainly in the firmware repo above. Typically, you would add functions in the protobufs repo and the device repo to implement module functionality. You probably also want to have some client or device, use or interact with the module. This is where Device Interface support comes into play.
- **Meshtastic Python CLI** - The [meshtastic/Meshtastic-python repository](https://github.com/meshtastic/Meshtastic-python) is a command line utility that allows you to interact with most of the device settings and functionality. This python library can also be consumed for other applications. See [Meshtastic Python Development](/docs/development/python/) for more details
- **Meshtastic Web** - The [meshtastic/web repository](https://github.com/meshtastic/web) is where the hosted web server on the ESP32 devices in Typescript is developed. See the [Web Development Overview](/docs/development/web/) for more details.
- **Meshtastic JS** - The [meshtastic/meshtastic.js](https://github.com/meshtastic/meshtastic.js) repository is a JavaScript library that provides an interface for Meshtastic devices. See [Javascript Development](/docs/development/js) for more details
- **Android App** - The [meshtastic/Meshtastic-Android](https://github.com/meshtastic/Meshtastic-Android) repository contains the Kotlin code for Android based interactions with Meshtastic devices. See the [Android development instructions](/docs/development/android) on how to create a development environment and build the Meshtastic Android App.
- **Apple Apps** - The [meshtastic/Meshtastic-Apple](https://github.com/meshtastic/Meshtastic-Apple) repository contains the SwiftUI client applications code for iPhone, iPad and Mac.
The Meshtastic website (the one you are looking at right now) is in the [meshtastic/Meshtastic](https://github.com/meshtastic/meshtastic) repository. See [Maintaining Documentation](/docs/development/docs) for more details.