---
title: "Contributions"
canonical: https://www.quantconnect.com/docs/v2/lean-engine/contributions
markdown: https://www.quantconnect.com/docs/v2/lean-engine/contributions.md
language: python
source: https://github.com/QuantConnect/Documentation/tree/master/06%20LEAN%20Engine/02%20Contributions
modified: 2026-11-10
index: https://www.quantconnect.com/llms.txt
---

# Contributions

[Documentation](https://www.quantconnect.com/docs/v2.md) > [LEAN Engine](https://www.quantconnect.com/docs/v2/lean-engine.md) > Contributions

> Code examples are shown in Python. Append `?lang=csharp` to this URL for the C# version of this page.

## Pages in This Section

- [Datasets](https://www.quantconnect.com/docs/v2/lean-engine/contributions/datasets/key-concepts.md)
- [Brokerages](https://www.quantconnect.com/docs/v2/lean-engine/contributions/brokerages.md)
- [Indicators](https://www.quantconnect.com/docs/v2/lean-engine/contributions/indicators.md): A tutorial on how to contribute a custom indicator to Lean algorithmic trading engine.