The Source2PDF tool is a small application which converts a directory full of source code into a single PDF file. It includes a table of contents, a title page, and is chaptered by subdirectories. This allows for easy, portable source code distribution.
Monolith (lith) is a tiny, java-based embedded file-system like implementation. It allows you to store and retreive multiple sets of named data in a single file and access it without the speed costs typically associated with file archives.
JetS3t is a free, open-source Java toolkit and application suite for Amazon Simple Storage Service (Amazon S3), Amazon CloudFront content delivery network, and Google Storage for Developers. Code is available from http://bitbucket.org/jmurty/jets3t