Downloading EditSeq 8.1 for Mac from our website was free. This Mac app is an intellectual property of DNASTAR. The program is included in Education Tools.
From the developer:
EditSeq enables you to work on nucleic acid and protein sequences of all sizes from a wide variety of popular formats. You can also utilize the integrated internet interface to search NCBI's databases to locate sequences by accession number, sequence similarity via BLAST, or keyword searches via the Entrez text query. For your convenience, EditSeq separates the sequence, comments and annotations into three editable panes.
You may want to check out more Mac applications, such as LXVII, iSurf BrainView or Scilab, which might be related to EditSeq.