<li><a href="https://github.com/petertodd/timelock">Create a secret key that can be decrypted in a known amount of time using parallel-serial hash chains.</a></li>
<li><a href="https://github.com/Blockstream/contracthashtool">Pay to Contract Hash calculator</a></li>
<li><a href="https://github.com/vinumeris/lighthouse/blob/master/docs/Design%20doc.md">Lighthouse - simple SIGHASH_ANYONECANPAY multi-party payments</a></li>
<li><a href="https://github.com/petertodd/timelock">Create a secret key that can be decrypted in a known amount of time using parallel-serial hash chains.</a></li>
<li><a href="https://github.com/Blockstream/contracthashtool">Pay to Contract Hash calculator</a></li>
<li><a href="https://github.com/vinumeris/lighthouse/blob/master/docs/Design%20doc.md">Lighthouse - simple SIGHASH_ANYONECANPAY multi-party payments</a></li>