Nethereum is an open source .NET integration library for Ethereum. It is designed to help developers easily integrate the Ethereum blockchain into their .NET applications. It consists of modular libraries for features that are covered are writing smart contracts, cryptographic wallets, DApps, and managing blockchain data.

Lamden

Universa is developing a customizable blockchain platform that will enable real-time transactions, offline smart contracts, and escrow payments. Their network is currently powered by the Ethereum-based UNTP token.