Download of Sieve 0.2.2 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. Sieve for Mac lies within Internet & Network Tools, more precisely Browser extensions.
This free Mac app is an intellectual property of Thomas Schmid. The most popular version of the application is 0.2. The latest version of the program can be installed on Mac OS X 10.6 or later. We recommend checking the downloaded files with any free antivirus.
From the developer:
Sieve is a small extension for Thunderbird browser. This extension implements the ManageSieve protocol for securely managing Sieve Script on a remote IMAP server. This app runs and stores all scripts on the server-side. The application is very easy to use.
You may want to check out more Mac applications, such as Screen Sieve, SpamSieve or AuctionSieve, which might be similar to Sieve.