Apache HttpComponents Client
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.
Apache HttpComponents Core (blocking I/O)
The MongoDB Java Driver uber-artifact, containing mongodb-driver, mongodb-driver-core, and bson
Apache Hadoop Client aggregation pom with dependencies exposed
Async Http Client library purpose is to allow Java applications to easily execute HTTP requests and asynchronously process the HTTP responses.
Jersey core client implementation