Downloading Ammonite 1.24 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. This Mac app is a product of Soma-Zone. We recommend checking the downloaded files with any free antivirus. Ammonite for Mac relates to Productivity Tools.
From the developer:
Ammonite is an add-on to DEVONthink Pro. While DEVONthink allows you to tag your data, it's search capabilities are currently very limited when it comes to tags and dates. It does not allow to search for documents which are not tagged with a certain tag. Searches for data tagged with multiple tags are possible, but involve opening the find panel, clicking 'Advanced&' and building the query manually.
You may want to check out more software for Mac, such as TinyCal, Remember or TaskMate, which might be related to Ammonite.