OpenXAdES enables people to work with legally-binding digital signatures (primarily giving and verifying them). Legislation often defines a set of requirements that legal digital signature technologies and infrastructures must be compliant with, and OpenXAdES aims at meeting many, if not all, such requirements from different legislations.
Addresses is a GNUstep address book that consists of a full-featured address book manager application, a source-code compatible replacement for Apple's AddressBook.framework (for accessing and manipulating address data programmatically), a framework of view/editor classes that make it easy to use Addresses from your own programs, and a number of tools. It is easy to use by both users and programmers and can store almost all imaginable data, including multiple phone numbers, emails, and addresses, photos, AIM/Jabber/ICQ/Yahoo IM details, and notes. It supports drag-and-drop and integrates well with GNUMail.
seedBlogs is a modular building block that lets you add PHP and MySQL-backed dynamic content to any Web site. You design and build your Web site however you want; seedBlogs simply handles the dynamic part. You can plug seedBlogs modules into your Web site wherever you want lists of posts (or books, news, quotes, etc.) to appear. With very little effort, you can create a customized Web site that you and your organization can update and edit from the Web.