OpenEthereum

Besides providing millions around the world with access to digital money (aka cryptocurrencies), Ethereum's blockchain is also one of the first and best platforms for developing and running a plethora of apps.

To make use of Ethereum's blockchain, any given user requires various things, one of which is a good client.

OpenEthereum is an open-source, fast, lightweight, and feature-packed Ethereum client designed to provide the core infrastructure essentials for reliable services.

The main aspects of OpenEthereum are as follows: it's designed to be the fastest, lightest, and most secure Ethereum client, it's developed using the Rust programming language, and it runs a JSON-RPC HTTP server on port :8545 and a Web-Sockets server on port :8546.

Since it's open-source and thanks to its clean and modular codebase, it is fully configurable and supports an unlimited number of APIs. The client doesn't sport a GUI per se, as it is CLI-based.

The upside is that it has a minimal memory and storage footprint, and it's also why it can be easily integrated into other services or products (pretty everything that requires fast synchronization and maximum uptime with Ethereum's blockchain).

The biggest advantage of OpenEthereum, however, is the fact that it can synchronize Ethereum's blockchain in a matter of hours, and not days. This is all possible thanks to a technology called Warp Sync.