Electrum

Electrum is a lightweight Bitcoin client.

Main features:

• Encrypted wallet
• Deterministic key generation. If you lose your wallet, you can recover it from its passphrase.
• No blockchain download; the client requests that information from a server
• Private keys are not shared with the server.
• Firewall friendly: The client does not need to open a port, it simply polls the server for updates.
• No single point of failure: The server code is open source, anyone can run a server.
• Python. Very compact code, easy to contribute.

links

• homepage: http://ecdsa.org/electrum
• source code: https://gitorious.org/electrum
• download: git clone git://gitorious.org/electrum/electrum.git