network

HTTPClient provides an efficient, up-to-date, and feature-rich package implementing the client side of the most recent HTTP standards and recommendations.

Square’s meticulous HTTP client for Java and Kotlin.

A type-safe HTTP client for Android and Java.

Apache HttpComponents Core (blocking I/O)

The HttpClient component supports the client-side of RFC 1945 (HTTP/1.0) and RFC 2616 (HTTP/1.1) , several related specifications (RFC 2109 (Cookies) , RFC 2617 (HTTP Authentication) , etc.), and provides a framework by which new request types (methods) or HTTP extensions can be created easily.

Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

Apache Commons Net library contains a collection of network utilities and protocol implementations. Supported protocols include: Echo, Finger, FTP, NNTP, NTP, POP3(S), SMTP(S), Telnet, Whois

A Clojure HTTP library wrapping the Apache HttpComponents client.

OkHttp

JSch is a pure Java implementation of SSH2