United States Computer Emergency Readiness Team provides publications, alerts, and tips to improve cybersecurity.
The Open Web App Security Project
"The Open Web Application Security Project (OWASP) is a 501(c)(3) worldwide not-for-profit charitable organization focused on improving the security of software."
MSDN Library- Microsoft Developer Network
"an essential source of information for developers using Microsoft tools, products, technologies, and services, includes how-to and reference documentation, sample code, technical articles."
The Linux Documentation Project
Access tutorials, long-form guides, man pages, and FAQs for a wide variety of Linux and open-source software projects.