db4o is an object database for Java and all .NET environments. Its features include ACID transactions, automatic class schema recognition, query-by-example, a S.O.D.A. object querying API, native queries, LINQ support on .NET, callback methods, memory files, cascade-on-delete, multi-threaded access, and Java Webstart and servlet support.
The Open-Transactions project is a collaborative effort to develop a robust, commercial-grade, fully-featured, free-software toolkit implementing a full-strength financial cryptography library, API, CLI, and prototype server. Open-Transactions democratizes financial and monetary actions. You can use it for issuing currencies/stock, paying dividends, creating asset accounts, sending/receiving digital cash, writing/depositing cheques, cashier's cheques, creating basket currencies, trading on markets, scripting custom agreements, recurring payments, escrow, etc. Strong crypto is used. Balances are unchangeable (even by a malicious server). Receipts are destructible and redundant. The transactions are unforgeable. The cash is untraceable. The cheques are non-repudiable.
The Aspose.Email for Android API enables developers to design Android applications for managing and manipulating Outlook email file formats without using MS Outlook. It provides tools to create, read, and convert the Outlook MSG, PST, EML, EMLX, OST, and MHT file formats. It manages recipients, subjects, message bodies, and attachments in MSG documents. It creates and save appointments in draft format, extracts and saves calendar items from a PST, and adds Mapi Items such as Messages, Contacts, Notes, Journals, and Tasks to a PST. It also lets you manipulate message attachments with just a few lines of code.