Bitcoin is both a cryptocurrency and an electronic payment system.

Nxt is an open source cryptocurrency and payment network.

Qalculate! is a multi-purpose desktop calculator for GNU/Linux (and Mac OS).

OpalCalc is an interesting combination of a scientific calculator and a spreadsheet, which comes packed with features.

Groestlcoin is a multipurpose cryptocurrency that has instant & private transactions with minimal fees.

Lingoes is a single-click multi-lingual translation software program released as a freeware translation utility.

Litecoin (LTC) is a peer-to-peer cryptocurrency and open source software project.

XE (XE Currency) is an online currency converter.

Ethereum is an open-source, public, blockchain-based distributed computing platform featuring smart contract (scripting) functionality.

TransferWise is an international service to send currencies across countries.