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Stunnel lets you encrypt any TCP connection with SSL/TLS, adding security to existing apps without changing their code. Free, multiplatform, open-source tool.
Add SSL/TLS encryption to any TCP connection
Stunnel is a free, open-source tool that helps you secure your network connections by adding SSL or TLS encryption to any TCP-based service. You don't need to modify your existing applications—just run them through Stunnel to protect sensitive data as it travels across networks.
Whether you're running a server, using a client, or managing a large deployment, Stunnel is designed for security, portability, and scalability. It's easy to set up, works on multiple platforms, and supports advanced features like load balancing. If you want to quickly and reliably encrypt your traffic, Stunnel is a straightforward solution.
You'll find downloads, documentation, and support resources on the site, making it simple to get started or troubleshoot any issues. Stunnel is popular for anyone who needs to upgrade the security of their network communications without complex changes.
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Charles Proxy lets you monitor and analyze HTTP/HTTPS traffic between your computer and the internet, helping developers debug and inspect network activity.
Surge for Mac is an advanced web debugging proxy and network tool for Mac and iOS, helping you manage, monitor, and secure your web traffic easily.
mitmproxy is a free, open-source HTTPS proxy for intercepting, inspecting, and modifying web traffic—perfect for debugging, testing, and privacy checks.
Objective Development offers network monitoring and productivity apps for macOS, helping you track connections and boost workflow on your Mac.
YouGetSignal.com offers easy-to-use online network tools like port checkers and trace routes to help you test and troubleshoot your internet connection.
Wireshark lets you capture and analyze network traffic to troubleshoot issues, learn about protocols, and improve network security. Free downloads available.
Analyze and decrypt network traffic from any device on your WiFi using a simple macOS tool. Monitor iPhone, Android, and PC connections securely and easily.
Shadowsocks is a fast, open-source proxy tool that lets you bypass internet firewalls and access blocked content securely and privately.
Get access to 200M+ real residential IP proxies worldwide for secure browsing, web scraping, and online privacy. Easy dashboard and flexible targeting.
Pushpin is a reverse proxy tool that helps you add realtime capabilities to your APIs, making it easier to handle live data and updates for your apps.
Get secure, global residential proxies for scraping and bypassing geo-blocks, or earn money by sharing your unused internet bandwidth with PacketStream.
Buy personal anonymous IPv4 and IPv6 proxies for secure, private browsing and accessing social networks. Supports HTTPS and Socks5 proxy connections.
Buy fast, anonymous proxy servers for private browsing, data collection, or security. Get free proxies, rotating IPs, and global coverage with Webshare.
Pagekite lets you securely expose your local web server to the internet, making it easy to share and test localhost projects from anywhere.
Get fast, private 4G & 5G mobile proxies from multiple countries for web scraping, automation, and data gathering—powered by AI and easy to start.
IPRoyal offers premium proxy services with no contracts, non-expiring traffic, and easy self-service for browsing, testing, and managing IPs worldwide.
Envoy is an open source edge and service proxy for cloud-native apps, helping you manage traffic, APIs, and microservices with reliability and flexibility.
Oxylabs offers high-quality proxy services and web scraping tools, letting you collect public web data easily using a large, ethical proxy network.
ProxySQL is a high-performance open source proxy for MySQL and compatible databases, helping you scale, optimize, and manage database traffic efficiently.
Every Proxy lets you share your VPN connection with other devices easily, without ads or root access, and helps bypass network tethering restrictions.
PandaSpeed lets you bypass blocks and access sites like Google, Facebook, YouTube, and Netflix freely and securely, available in multiple languages.
Lionic offers advanced cybersecurity tools and services to protect your network, devices, and data from threats, with antivirus and secure browsing solutions.
sFlow.org provides tools and resources for monitoring high-speed networks, helping you optimize performance, track usage, and enhance network security.
NetLimiter lets you monitor, control, and manage your Windows network traffic in real time, set bandwidth limits, and boost your online security.
Bright Data offers proxy networks, web scraping tools, and ready-to-use datasets to help you access and collect data from any public website easily.
Get special Tor network bridges to bypass censorship and browse privately. Protect your connection from tracking and access the internet without restrictions.
IP sets is a Linux kernel framework and utility for managing and matching IP addresses, networks, and ports efficiently for firewall and security use.
Cipherdyne.org offers open-source tools for system and network security, including port knocking, single packet authorization, and intrusion detection.
Hiddify offers an easy-to-use VPN and proxy manager app for iOS, Android, Windows, macOS, and Linux to help you access the internet freely and securely.
ngrok lets you securely expose your local servers to the internet with just one command, making remote testing and sharing easy for developers.
Worldwide Stunnel.org Alternatives
Monitor, capture, and control all your network traffic with Stash. Redirect or block connections and manage requests easily on iOS, tvOS, and macOS.
adam.law.harvard.edu is a frontend web proxy server for the Berkman Klein Center, helping users access web content or internal resources efficiently.
Handle Proxy lets you look up and view digital object handles using a web form, making it easy to resolve handles without extra software.
Tinyproxy offers a lightweight HTTP/HTTPS proxy solution for POSIX systems, ideal for embedded or low-resource environments. Open source and fast.
Buy Clash proxy and VPN subscriptions for fast, global internet access with customizable configurations and multiple nodes. Chinese language site.
A frontend web proxy server by Harvard's Berkman Klein Center, providing access to certain web resources and tools. Not intended for general browsing.
A web-based image proxy service that delivers images securely and efficiently, helping users access and display images from external sources.
UfunR lets you easily access blocked music and video content from anywhere, free and ad-free. Simple, cross-platform tool for bypassing region limits.
Liberty Shield offers secure, fast VPN and proxy services to protect your privacy online and access global content on all your devices.
Access the internet securely and privately with shared IP addresses, helping you browse anonymously and protect your online activity.
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