You could have downloaded HighfivePlugin 1.17 from our software library for free. The actual developer of the free software is Highfive. The most popular version of the software is 1.1. The software lies within Internet & Network Tools, more precisely Browser plugins.
From the developer:
Highfive plugin for Chrome integrates Highfive into Google Calendar. This allows you to easily add new conferences to events and join conferences already associated with events, while working in Google Calendar. The conference links you assign to events are included in event information received by invitees; they can easily click on the link to join your conference even if they aren't using this extension.
You may want to check out more software, such as SV Bookmark, which might be related to HighfivePlugin.