UnboundID LDAP SDK for Java
UnboundID LDAP SDK for Java is a fast, comprehensive, and easy-to-use Java API for communicating with LDAP directory servers and performing related tasks like reading and writing LDIF, encoding and decoding data using base64 and ASN.1 BER, and performing secure communication.
a "technical" component that could be integrated in any JAVA/JSP/Servlets application. It provides a simple API to read and store uploaded files sent from a browser
Vector Visuals provides an easy-to-use, object-based API for creating and manipulating Java2D-rendered shapes and images. It features object embedding, dynamic connectors, and multithreaded task support.
X10 CM17A API
an API to control the FireCracker Computer Interface (CM17A) from any computer with a serial port
X4J Analytic is a reporting API for Java. The implementation focuses on Excel reporting and delivers a high performance solution for huge reports.
XOM is an XML object model. It is a tree-based API for processing XML with Java that simultaneously supports streaming. In many use-cases, it can process arbitrarily large documents with effectively constant memory sizes. It strives for correctness, simplicity, and performance, in that order. XOM supports XSLT, Canonical XML, and XInclude.
an extensible object-relational mapping layer for Java applications. It provides interface-based persistence to RDBMSs while allowing developers to focus on the object model, not the physical layer
a Java API for XPointer. XPointer is a W3C standard for addressing into the internal structure of XML documents
XT is a fast, free implementation of XSLT in java.