DNActions 1.2 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within System Tools, more precisely Dashboard Widgets. This free Mac app is a product of Nacho Erquiaga. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
DNActions is a Mac OS X widget that can be used to perform common actions on DNA sequences. It is useful for scientists working in genetics and can be used to obtain the complement reverse of a DNA sequence, the protein translation in all six reading frames (three in the forward strand and three in the reverse), find CpG dinucleotides and calculate the composition and the Tm (melting temperature) of a DNA molecule.
You may want to check out more software for Mac, such as MIXPOD.com Music Player, OrariFS or Niagara Falls, which might be related to DNActions.