TextSer 3.2 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 actual developer of this free Mac application is onflapp. The program lies within Productivity Tools, more precisely Office Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
TextSer is a service tool for text writers. With this app, you can write markdown in Evernote, highlight source code fragments in Outlook, turn web links into QR code. With TextSer you can write in markdown virtually anywhere. You can select the text and turn it to a rich text format in-place. You can use a word processor, e-mail client or note-taking application of your choice, yet be free from fighting the formatting styles.
You may want to check out more software for Mac, such as iTeXMac2, PDFViewer or Instant PDF, which might be similar to TextSer.