BitCoin - 2009
Bitcoin is an open-source project where anyone can participate. No one owns or controls it.
LiteCoin - 2011
Litecoin is a form of open, censorship-free, decentralized money
Namecoin - 2011
Namecoin is an open source solution that aims to improve the decentralization, security, privacy and speed of specific internet infrastructure components
A cryptocurrency called Peercoin uses both proof-of-stake and proof-of-work algorithms
An open-source cryptocurrency called Gridcoin uses the BOINC network to safety reward volunteer computation.
Each of these coins offers its advantages, such as low transaction fees and faster confirmation times.