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open source

BitListen.com

Realtime Bitcoin transaction visualizer. See and hear new transactions, trades and blocks as they propagate.
http://www.bitlisten.com/

Brainwallet

JavaScript client-side bitcoin address and deterministic wallets generator, Base58 converter, transaction builder, signing and verifying messages with Bitcoin address.
https://brainwallet.github.io/

Bitcoin Block Explorer

Bitcoin Block Explorer is an open source web tool that allows you to view information about the blocks, addresses, and transactions created by Bitcoin.
http://blockexplorer.com/

#recksplorer

Lightning Network Explorer. Source available at https://github.com/chemicstry/recksplorer.
https://lnmainnet.gaben.win/

SegWit Paper Wallet

Segwitaddress.org is an open source bitcoin paper wallet generator that utilizes Segregated Witness (SegWit) Pay To Witness Public Key Hash (P2WPKH) addresses and transactions. Segwitaddress.org uses the BitcoinJS library. All of the functions on this page can be ran offline.
https://segwitaddress.org/

Omni Explorer

OmniExplorer is a Block Explorer for the Omni protocol which is created and maintained by the Omni Foundation. It allows you to query address balances and transaction data on the Omni protocol. Over time additional statistics, information, tools may be added to assist the community.
https://omniexplorer.info/

Crypto Trading Tools

Links to Github repositories, SourceForge and other sources of code and historical data that might be useful to BTC traders for automated trading, backtesting or sentiment analysis.
https://cryptotradingtools.com

Electrum Bitcoin Client

Electrum is an easy to use Bitcoin client. It protects you from losing coins in a backup mistake or computer failure, because your wallet can be recovered from a secret phrase that you can write on paper or learn by heart. There is no waiting time when you start the client, because it does not download the Bitcoin blockchain.
https://electrum.org/

Coinpunk

Coinpunk is a project to build an open source, self-hosted DIY bitcoin wallet service you can run on your own server.
http://coinpunk.org/

Coinb.in

A Bitcoin Wallet written in Javascript. Supports Multisig, Custom Transactions, nLockTime and more!
https://coinb.in/

Vanitygen

A standalone command line vanity address generator.
https://github.com/samr7/vanitygen

BTProof

Trusted timestamping on the Bitcoin blockchain.
https://www.btproof.com/

Proof of Existence

Use our service to anonymously and securely store an online distributed proof of existence for any document. Your documents are NOT stored in our database or in the Bitcoin blockchain, so you don't have to worry about your data being accessed by others.
http://www.proofofexistence.com/

Airbitz Bitcoin Wallet

A secure, encrypted, and backed up Bitcoin wallet with advanced features such as Bluetooth and NFC fund transfers.
https://airbitz.co/bitcoin-wallet/