CTFs as you need them
WinSCP is a free SFTP, SCP, S3, WebDAV, and FTP client for Windows.
Anti-Spam SMTP Proxy Server implements multiple spam filters
PHP Framework for building scalable API's on top of Laravel
Malicious traffic detection system
Amazon SNS message validation for PHP
GRR Rapid Response, remote live forensics for incident response
Extensible security first OAuth 2.0 and OpenID Connect SDK for Go
Loads environment variables automatically
Defeating Windows user account control
A dead simple VPN
A lightweight and easy-to-use password manager
Quality of service module for Apache httpd
Cloudflare's PKI and TLS toolkit
AWStats Log Analyzer
Real-time HTTP Intrusion Detection
CacheGuard Gateway is a UTM, a WAF, and a QoS management appliance.
Wapiti is a web-application vulnerability scanner
A complete SpyWare.
An encrypted file system that mounts with FUSE on Linux
For full, incremental, compressed and encrypted backups or archives