The 2.5 version of Longhand 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 application lies within Education Tools, more precisely Science.
The unique ID for this program's bundle is com.scottfr.longhand. The following version: 2.5 is the most frequently downloaded one by the program users. Commonly, this program's installer has the following filename: Longhand.zip. The actual developer of this free Mac application is Scott Fortmann-Roe.
From the developer:
Longhand is a calculator for Mac OS X built from the ground up to facilitate calculation. Most other computer calculators try blindly to emulate the physical format of their predecessors. What works well in the real world, however, functions worst, and is often not desired, in its virtual sibling.
You may want to check out more software for Mac, such as Calcline, Schematics Plus or Graphing Calculator, which might be similar to Longhand.