Freecoin is a versatile version of the bitcoin framework, supporting language bindings and multiple currencies. It aims to share code with the original bitcoin implementation, while cleaning up its architecture. Freecoin strips down the backend bitcoin code to its essentials, while moving external tasks to language bindings (primarily Python). It also adds the possibility to customize the genesis block, allowing the creation of new currencies.
Bitcoinproof creates a forgery-proof timestamp for your data, secured by the Bitcoin network. It allows you to prove that a certain event happened before a certain point in time. Maybe you want to prove that the damage in your flat already existed when you moved in, or that you were in possession of a great artwork before it was published, proving you are the author.
BitWrk is creating a marketplace where participants can buy or sell computing power like stocks in a stock exchange, using Bitcoin as currency. The client software can be integrated with existing, compute-intensive applications (e.g. rendering software), creating a big boost by harnessing the combined computing power of the BitWrk network. Sellers earn money by putting their hardware to work, offering an alternative to Bitcoin mining.