Fenix is a desktop web server for developers. It is simple and easy to use, because simple stuff shouldn't need Apache, IIS, or NGINX. It helps to visually manage local sites side by side, with thumbnails, logs, and more.

Fenix - A simple and visual static web server with collaboration features

curl is used in command lines or scripts to transfer data. It is also used in cars, television sets, routers, printers, audio equipment, mobile phones, tablets, settop boxes, media players and is the internet transfer backbone for thousands of software applications affecting billions of humans daily. 
 
It supports DICT, FILE, FTP, FTPS, Gopher, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, Telnet and TFTP. curl supports SSL certificates, HTTP POST, HTTP PUT, FTP uploading, HTTP form based upload, proxies, HTTP/2, cookies, user+password authentication (Basic, Plain, Digest, CRAM-MD5, NTLM, Negotiate and Kerberos), file transfer resume, proxy tunneling and more.

curl is used in command lines or scripts to transfer data. It is also used in cars, television sets, routers, printers, audio equipment, mobile phones, tablets, settop boxes, media players and is the internet transfer backbone for thousands of software applications affecting billions of humans daily. 

curl - A command line tool and library for transferring data with URL syntax, supporting HTTP, HTTPS, FTP, FTPS, GOPHER, TFTP, SCP, SFTP, SMB, TELNET, DICT, LDAP, LDAPS, FILE, IMAP, SMTP, POP3, RTSP and RTMP

Memorable site for testing clients against bad SSL configs. 

badssl.com - Memorable site for testing clients against bad SSL configs

mkcert is a simple tool for making locally-trusted development certificates. It requires no configuration. Using certificates from real certificate authorities (CAs) for development can be dangerous or impossible (for hosts like localhost or 127.0.0.1), but self-signed certificates cause trust errors. Managing your own CA is the best solution, but usually involves arcane commands, specialized knowledge and manual steps.
 
mkcert automatically creates and installs a local CA in the system root store, and generates locally-trusted certificates. mkcert does not automatically configure servers to use the certificates, though, that's up to you.

mkcert is a simple tool for making locally-trusted development certificates. It requires no configuration. Using certificates from real certificate authorities (CAs) for development can be dangerous or impossible (for hosts like localhost or 127.0.0.1), but self-signed certificates cause trust errors. Managing your own CA is the best solution, but usually involves arcane commands, specialized knowledge and manual steps.

mkcert - A simple zero-config tool to make locally trusted development certificates with any names you'd like

Human-friendly and powerful HTTP request library for Node.js. It is almost API compatible with the browser fetch API. It supports Promise API, Stream API, HTTPS/2 support, Progress events and Hooks.

GOT - Human-friendly and powerful HTTP request library for Node.js


NanoHttpd is a light-weight HTTP server designed for embedding in other applications.It supports HTTPS (SSL), Cookies, Built-in support for HEAD, POST and DELETE requests. You can easily implement/customize any HTTP method, though, File upload, HTTP 1.1 support and lot more.

NanoHTTPD – A Tiny web server in Java

SSLsplit is a tool for man-in-the-middle attacks against SSL/TLS encrypted network connections. It is intended to be useful for network forensics, application security analysis and penetration testing. SSLsplit is designed to transparently terminate connections that are redirected to it using a network address translation engine. SSLsplit then terminates SSL/TLS and initiates a new SSL/TLS connection to the original destination address, while logging all data transmitted. Besides NAT based operation, SSLsplit also supports static destinations and using the server name indicated by SNI as upstream destination. SSLsplit is purely a transparent proxy and cannot act as a HTTP or SOCKS proxy configured in a browser.
 
SSLsplit supports plain TCP, plain SSL, HTTP and HTTPS connections over both IPv4 and IPv6. It also has the ability to dynamically upgrade plain TCP to SSL in order to generically support SMTP STARTTLS and similar upgrade mechanisms. SSLsplit fully supports Server Name Indication (SNI) and is able to work with RSA, DSA and ECDSA keys and DHE and ECDHE cipher suites. Depending on the version of OpenSSL built against, SSLsplit supports SSL 3.0, TLS 1.0, TLS 1.1 and TLS 1.2, and optionally SSL 2.0 as well.

SSLsplit is a tool for man-in-the-middle attacks against SSL/TLS encrypted network connections. It is intended to be useful for network forensics, application security analysis and penetration testing. SSLsplit is designed to transparently terminate connections that are redirected to it using a network address translation engine. SSLsplit then terminates SSL/TLS and initiates a new SSL/TLS connection to the original destination address, while logging all data transmitted. 

SSLsplit - Transparent SSL/TLS interception

Caddy is a general-purpose HTTP/2 web server that serves HTTPS by default. Caddy is fast, easy to use, and makes you more productive.
<ul>
<li>Easy configuration with the Caddyfile</li>
<li>Automatic HTTPS on by default (via <a href="https://letsencrypt.org">Let's Encrypt</a>)</li>
<li>HTTP/2 by default</li>
<li>Virtual hosting so multiple sites just work</li>
<li>Experimental QUIC support for those that like speed</li>
<li>TLS session ticket key rotation for more secure connections</li>
<li>Extensible with plugins because a convenient web server is a helpful one</li>
<li>Runs anywhere with no external dependencies (not even libc)</li>
</ul>

Caddy is a general-purpose HTTP/2 web server that serves HTTPS by default. Caddy is fast, easy to use, and makes you more productive.

Caddy - Fast, cross-platform HTTP/2 web server with automatic HTTPS

The wolfSSL embedded SSL library (formerly CyaSSL) is a lightweight SSL/TLS library written in ANSI C and targeted for embedded, RTOS, and resource-constrained environments - primarily because of its small size, speed, and feature set. It is commonly used in standard operating environments as well because of its royalty-free pricing and excellent cross platform support. 
 
wolfSSL supports industry standards up to the current TLS 1.3 and DTLS 1.2 levels, is up to 20 times smaller than OpenSSL, and offers progressive ciphers such as ChaCha20, Curve25519, NTRU, and Blake2b. User benchmarking and feedback reports dramatically better performance when using wolfSSL over OpenSSL.

The wolfSSL embedded SSL library (formerly CyaSSL) is a lightweight SSL/TLS library written in ANSI C and targeted for embedded, RTOS, and resource-constrained environments - primarily because of its small size, speed, and feature set. It is commonly used in standard operating environments as well because of its royalty-free pricing and excellent cross platform support. 

wolfssl - (formerly CyaSSL) is a small, fast, portable implementation of TLS/SSL for embedded devices to the cloud

phin is trusted by some really important projects. The hundreds of contributors at Less, for example, depend on phin as part of their development process.Also, phin is super lightweight. Like 99.6% smaller than request lightweight.

Phin - The ultra-lightweight Node.js HTTP client

aria2.js is a NodeJS Javascript library and cli for aria2, "The next generation download utility". It controls aria2 via its JSON-RPC interface.

aria2.js - JavaScript library for aria2, "The next generation download utility"

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