CasualConc 1.9.6 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
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. The actual developer of this free Mac application is Yasu Imao. The application lies within Education Tools, more precisely Science. The following version: 1.0 is the most frequently downloaded one by the program users.
From the developer:
CasualConc is a concordance program that runs natively on Mac OS X 10.5 Leopard or later. It is designed for casual use (preliminary analysis or non-research purposes). CasualConc can handle a corpus with 1 million tokens at reasonable speed. If your corpus has more than 10 million tokens, it can be very slow depending on how many hits it returns (based on my machine Mac mini C2D 2.0GHz).
You may want to check out more Mac applications, such as Calcline, Schematics Plus or Graphing Calculator, which might be similar to CasualConc.