The 2.1.0 version of B64 for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. B64 for Mac belongs to Developer Tools. The actual developer of this free software for Mac is Mahtca Global S.R.L.
From the developer:
B64 is a fast image encoder and decoder that provides a friendly and straightforward graphic design. The application can be used whenever you want to encode or decode images in no time, import base64 strings directly from file or reconstruct images from a base64 string you already have.
You may want to check out more software for Mac, such as MacCVSClient X, AcidSearch Installer or AlbumEnabler, which might be related to B64.