Sphere is a smart contract platform and peer-to-peer payment network. The network has a hybrid PoW and PoS consensus mechanism and is powered by the native SPHR token, which can be swapped for an ERC20 token over the Ubiq smart contract platform.

Dogecoin is a cryptocurrency with a focus on fun, generosity, and community. It is unlike many other blockchain projects in that it does not aim to solve any ambitious problems. Dogecoin was originally created as a meme coin and has gained a large following that use the coin (DOGE) as an internet tipping and fundraising system.
Although Dogecoin was first created as somewhat of a joke, it has a passionate community that has used the platform for a variety of purposes. The project has gained widespread publicity and DOGE is traded on many exchanges.

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Spendcoin is an open-sourced cryptocurrency designed for the Cross Ledger Ecosystem, which includes the Spend App and the Blockchain University. The project is run by the Spend Foundation. Their network is currently powered by the Ethereum-based SPND token. Users receive tokens for performing tasks in the Spen ecosystem.