Bitcoin Armory is a no-frills Bitcoin wallet (as of yet, that's the only cryptocurrency it supports) designed for heavy investors who consider the security of their accounts their highest priority. The Armory program is can be downloaded onto Windows, MacOS, Ubuntu or Linux machines, making it essentially a software wallet (however, do-it-yourself-instructions for creating a hard-copy paper wallet are given on their website). Depending upon the user's expertise, there are “Standard,” “Advanced” and “Developer” settings for the Armory wallet. The wallet is designed to be offline—which means it's stored on a computer or drive that isn't connected to the Internet—and should only be copied to an online drive or machine when access to the account is needed for a transaction. The online version of Armory can be resource-intensive—which is one of the reasons it doesn't come in mobile form—but the offline version is extremely space- and energy-friendly. Armory currently runs as an add-on to the main Bitcoin client, but a standalone version is in the works.
The Bitcoin Armory wallet was introduced as a concept by programmer and user interface (UI) designer Alan Reiner on January 3, 2012, and—thanks to crowd funding—was released for public use later that year. Thanks to Reiner's self-promotion on various Bitcoin forums, the Armory wallet is building a reputation for its focus on safe and secure account storage.