Algo VPN is a deployment tool that automates the setup of a personal VPN server on cloud providers or local Ubuntu machines. It uses Ansible to provision a hardened server running strongSwan (IKEv2/IPsec) and WireGuard, with optional DNS encryption via dnscrypt-proxy and privacy enhancements like log rotation and history clearing. The architecture is a set of Ansible playbooks and roles, orchestrated by a shell script entry point (`algo`) that invokes `ansible-playbook`. Cloud provisioning is handled by provider-specific roles (AWS EC2, DigitalOcean, Azure, GCE, etc.), while server configuration roles handle system hardening, PKI certificate generation, VPN service configuration, and client profile generation (mobileconfig, WireGuard .conf, QR codes). The system is designed for security and privacy: it uses strong crypto defaults (ECC secp384r1), minimal logging, and unattended upgrades. External dependencies include Ansible, community.crypto collection, cloud provider SDKs, and the dnscrypt-proxy package. The primary data flow is: user edits `config.cfg` → Ansible playbook runs → cloud VM is created → server is configured with VPN services → client configuration files are generated and stored locally. User management (add/revoke) is handled by a separate playbook. The repository includes extensive unit, integration, and end-to-end tests, with Docker-based integration testing and CI/CD via GitHub Actions.

CoBRA is a C++ library and CLI tool for simplifying mixed Boolean-arithmetic (MBA) expressions, commonly used in software obfuscation. It ingests expressions combining arithmetic (+, -, *) with bitwise (&, |, ^, ~) and shift operators and outputs a simplified equivalent form. The core engine uses a worklist orchestrator that coordinates 36+ passes, including signature-based transforms (CoB butterfly, ANF recovery), semilinear normalization with bit partitioning, decomposition (product, polynomial, template cores), ghost residual solving, and pattern matching. An optional Z3 verifier proves full-width equivalence. The tool can be used as a standalone CLI (`cobra-cli`), as an LLVM pass for automatic deobfuscation during compilation, or as a library (`cobra::Simplify()`). The codebase is well-structured with extensive test coverage (1195+ tests) and benchmark datasets from multiple research projects. While the core is tightly coupled internally, several generic utilities (Result type, profiling stubs, math helpers) are reusable independently.