A JSON Schema validation implementation in pure Java, which aims for correctness and performance, in that order
This is a burp intruder extender that is designed for automation and validation of XSS vulnerabilities.
Hibernate Validator - Bean Validation 2.0 Reference Implementation
A Java validation framework leveraging fluent interface style and JSR 303 specification
Governator is a library of extensions and utilities that enhance Google Guice to provide: classpath scanning and automatic binding, lifecycle management, configuration to field mapping, field validation and parallelized object warmup.
A Java library for generation and validation of the International Bank Account Numbers (IBAN ISO_13616) and Business Identifier Codes (BIC ISO_9362).
OVal - the object validation framework for Java
Schema validation and conversion based on RELAX NG