google-rfc-2445 is a Java implementation of RFC 2445 recurrence rules. RFC 2445 describes a scheme for calendar interoperability. This project implements core parts of RFC 2445, including a parser for recurrence rules and date lists and a mechanism for evaluating recurrence rules.
cintoo Messages is a framework to make internationalization easier for Java applications. It supports locales for threads, and bundles can be associated with different packages. This allows the usage of different bundles for different parts of the application, such as plugins, an installer, or a logging system. Bundles can be managed and associated with packages without any changes in the code. This makes bundle management and refactoring much easier than with other solutions. cintoo Messages supports global locales for client applications written in Swing or SWT and thread-local ones for serverside Web applications.
Ammentos is a lightweight persistence framework for JDK 5. It does not require any installation nor configuration; just put a jar file into your classpath and start writing code. It is designed so that your persistence code will be dramatically short and so that you won't have to spend a lot of time to learn how to use it. It is about 72Kb large and it does not require any external library except for your database JDBC driver. You can use it in desktop applications or in server-based environments.