Download of OneShare 2.0.2 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X is a product of OneShare.app. OneShare for Mac lies within Communication Tools, more precisely E-mail. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
OneShare is an application that takes the desired link, tweet, webpage, photo, or video and puts it into your Gmail Inbox or Google Drive. When you authorize Google Drive or GMail, it happens only on your local device -- meaning nobody has access to any of what you send to yourself or store in the cloud.
You may want to check out more Mac applications, such as Encrypt Mail or EEAO, which might be similar to OneShare.