SETools is a comprehensive SELinux policy analysis toolkit providing both command-line and GUI utilities for querying, comparing, and analyzing SELinux policies. The system consists of a core library (setools) for policy representation and analysis, GUI components (setoolsgui) for interactive analysis via apol, and specialized tools like seinfo (policy querying), sesearch (rule search), sediff (policy comparison), and setools-mcp (MCP server for LLM integration). The architecture features a modular design with clear separation between policy representation, querying mechanisms, difference analysis, and validation frameworks. Key strengths include a reusable query framework using descriptor patterns and mixins, a robust difference engine with wrapper-based caching, and a well-structured GUI following model-view patterns. The project demonstrates active maintenance with recent updates, strict dependency management, and extensive test coverage.
Tax-Calculator is a mature, open-source microsimulation library for static (and simple behavioral) analysis of the US federal individual income and payroll tax system. It provides a Python API and a CLI tool (`tc`) that allow users to define policy reforms via JSON parameter files, apply them to microdata samples (CPS, PUF, or TMD), and produce distributional tables, revenue estimates, marginal tax rates, and welfare measures. The core architecture separates policy parameters (`Policy`), taxpayer records (`Records`), and economic adjustments (`GrowFactors`, `GrowDiff`, `Consumption`) from the calculation engine (`Calculator`), which uses Numba JIT compilation for performance. While primarily an application/library with formal releases and CI/CD, it also bundles research data (CPS microdata, grow factors) and includes extensive cross-validation against NBER's TAXSIM-35 model. The codebase is well-structured, heavily tested, and actively maintained, with a clear modular design that supports both CLI and programmatic use.