If you’ve been searching for production-ready code examples that actually work, you know the frustration of wading through tutorials that stop halfway or sample projects that fall apart the moment you try to adapt them. That’s exactly why we built the ElysiaTools Samples Library — a curated collection of complete, copy-and-paste working examples spanning the technologies that actually matter in modern development.
Today, we’re showcasing 6 standout samples that cover everything from streaming data formats to AI agent frameworks. Each one is free, fully functional, and ready to drop into your next project.
1. NDJSON — Process Streaming Data Like a Pro
Working with large JSON datasets can bring your application to its knees if you’re loading everything into memory at once. NDJSON (Newline Delimited JSON) solves this by treating each line as an independent JSON object, enabling efficient stream processing.
Our NDJSON sample collection walks you through real-world use cases: parsing massive log files line by line, streaming API responses without timeout errors, and building data pipelines that handle gigabytes without breaking a sweat. The code shows exactly how to create custom NDJSON parsers with validation, handle malformed records gracefully, and build transform pipelines.
Whether you’re building analytics dashboards, processing sensor data, or handling event streams, NDJSON is the technique that keeps your memory footprint predictable.
2. Distributed Systems — Architecture Patterns That Actually Scale
Building software that runs across multiple machines sounds intimidating until you see it done right. The Distributed Systems samples demystify the patterns that power every serious backend: leader election using the Raft consensus algorithm, service discovery with consistent hashing, distributed caching with invalidation strategies, and graceful shutdown protocols.
These aren’t toy examples. Each sample implements a real distributed primitive you’d encounter in production systems — complete with failure scenarios and recovery logic. The code is annotated with explanations of why each design choice was made, so you’re not just copying — you’re actually learning the reasoning behind the architecture.
3. Event Sourcing — The Pattern That Changes How You Think About Data
What if instead of storing current state, you stored every event that led to that state? That’s the core idea behind Event Sourcing, and once it clicks, you’ll start seeing data problems differently. Our Event Sourcing samples cover the full implementation: event store design, projection building, snapshot strategies, and handling eventual consistency.
The examples include a complete event-sourced order management system where you can trace every state change through its event history, rebuild projections on demand, and implement time-travel queries. If you’ve ever wondered how to build audit trails that are actually useful, this is your answer.
4. Babylon.js — 3D Graphics Without the PhD
The web is increasingly visual, and Babylon.js is the most powerful open-source 3D engine that runs directly in the browser. Our Babylon.js sample collection takes you from zero to interactive 3D scenes: scene setup with cameras and lighting, PBR materials and custom shaders, physics simulation with particle effects, and full user interaction systems.
These samples bridge the gap between abstract 3D concepts and working web applications. You get complete TypeScript implementations — not pseudocode — with explanations of the rendering pipeline, shader basics, and optimization techniques for maintaining frame rates on mobile devices.
5. Ethereum & Solidity — Smart Contract Development Done Right
Blockchain development has a brutal learning curve, and most tutorials leave you with contracts that are unsafe to deploy. Our Ethereum Solidity samples start with fundamentals and build up to production-grade implementations: a complete ERC-20 token with minting, burning, and pausing; an ERC-721 NFT contract with IPFS metadata and royalty systems; and an automated market maker (AMM) with liquidity pools and yield farming.
Every contract in our collection has been audited for common vulnerabilities. We show you not just how to write the code, but why security patterns like checks-effects-interactions and reentrancy guards exist. By the end, you’ll have deployed real contracts to testnet and understand what you’re actually deploying.
6. LangChain — Build LLM Applications That Actually Work
LangChain makes building LLM-powered applications accessible, but the documentation assumes you already know what you’re doing. Our LangChain samples start from absolute fundamentals: prompt templates and chaining, conversation memory management, and then escalate to advanced patterns like custom agent tool systems, vector store integration for retrieval-augmented generation (RAG), and multi-agent orchestration.
These samples show you how to build real AI applications — not just “ask ChatGPT a question” demos. You’ll implement semantic search over your own documents, build agents that can use tools and make decisions, and understand the architecture patterns that make LLM applications reliable enough for production use.
Why These Samples Are Different
Every sample in the ElysiaTools library shares a few characteristics that set them apart from what you’ll find elsewhere:
- Complete implementations — No truncated code, no “imagine the rest here” placeholders. Every file compiles and runs.
- Production-aware — Error handling, edge cases, and security considerations are included, not afterthoughts.
- Well-documented — Each sample includes inline comments explaining the why, not just the what.
- Categorized by difficulty — Start with simple examples and work your way up to complex multi-file projects.
- Multi-language support — Most samples are available in English, Chinese, Spanish, French, German, and more.
Get Started Right Now
All of these samples are completely free and available at elysiatools.com. No signup required, no rate limiting, no paywalls. Pick the technology that matches your current project and start copying.
If you find these samples useful, share them with your team. The best code is code that gets used — and these are built to be used, not just admired.
All samples are open source. If you spot an issue or want to contribute, the ElysiaTools project welcomes pull requests from the community.
