FinRL-Meta is a comprehensive Python library and framework for applying deep reinforcement learning (DRL) to financial trading. It provides a modular, plug-and-play ecosystem consisting of market environments (stock, crypto, futures, forex, portfolio allocation, order execution optimization, market impact), data processors (Yahoo Finance, Alpaca, Binance, Tushare, etc.), and DRL agent wrappers (Stable-Baselines3, ElegantRL, RLlib). The library implements the full training-testing-trading pipeline, with CLI entry points (train.py, test.py, trade.py), backtesting engines (WonderTrader integration for futures), and paper trading capabilities (Alpaca). It is the market environment layer of the larger FinRL ecosystem and includes research-grade features such as market impact models, turbulence index, and ensemble strategies. The codebase is hybrid: while primarily an application/library, it contains numerous Jupyter notebooks, experimental sub-projects (order execution with qlib, high-frequency futures), and academic paper references. This reflects its dual role as both a reusable software framework and a research reproducibility platform. The architecture is well-structured with abstract base classes (data processors, impact models, environments), factory patterns, and consistent Gym/Gymnasium interfaces. However, the repository also carries technical debt from its research origins: hardcoded paths, mixed gym versions, deprecated library usage, and some incomplete or commented-out code. The most reusable components are the data processor base class (providing a common data pipeline) and the pluggable impact model hierarchy, both of which can be extracted with minimal modification for other financial RL or simulation projects.