Proof of Work with SHA256 and Bloom filter
Free Proof-of-Work API for fancy Vote Counting widgets
Bandwidth-hard proof of work
Scrypt KDF is used for BIP38 (encryption of private keys) and proof of work for some crypto currencies.
A P2P Delegated Proof of Work solution for Nano cryptocurrency
WebGL2 Nano Currency Proof of Work Generation
A simple middleware to do proof of work.
Proof-of-Work Hashcash demo
Rebroadcast unconfirmed Nano transactions with higher proof-of-work (PoW) to help restart expired elections.
Proof-of-Work captcha without external service calls
Protect online forms from spam by making them perform Proof of Work (PoW).
IOTA PoWer is a service that allows you to outsource your PoW (Proof of Work) to a server for a nominal fee.