The 1.0 version of Aproplus for Mac was available to download on 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 software for Mac is NovaStorm Software. We recommend checking the downloaded files with any free antivirus.
From the developer:
Aproplus is a fast, clean viewer for the UNIX 'apropos' command. It helps you find system and library functions and quickly view their associated man pages.
To use Aproplus, just type a term in the search area and hit the Enter key. Click on an item of interest in the list on the left, and the man page will be displayed on the right. If there are variations of a specific entry, a dropdown will allow you to view the different variants.