About Ripple:

Ripple is an independent digital asset that is native to the XRP Ledger. This cryptocurrency was created by Ripple Labs Inc. and published in 2005 as a financial service to provide protection payment options to members of the community via a global network. In 2011 it was modernized so that it works faster than Bitcoin. Ripple was characterized by a network block that is generated in as little as 3.5 seconds. On 4 January 2018, Ripple had its own ATH (All-Time High price), which was equal to $3.84.

Resources:

Official website: https://ripple.com
Whitepaper: https://ripple.com/files/ripple_consensus_whitepaper.pdf
Source Code: https://github.com/ripple