You could have downloaded BoardMaker3 1.33.0022 from our software library for free. The BoardMaker3 installer is commonly called BM3.exe. The actual developer of the program is Tsien (UK) Ltd. BoardMaker3 is developed for Windows XP/7/8/10/11 environment, 32-bit version. The following version: 1.3 was the most frequently downloaded one by the program users. BoardMaker3 lies within Education Tools, more precisely Science Tools.
From the developer:
Like the PCB symbol editors, BoardMaker3 has a flexible system for handling schematic components. Components are divided into two parts. The first of these is the symbol which is the logical element of the component together with its graphical representation. In the case of an opamp for example, the graphic is drawn with three pins. The functions of these pins are "Non-Inverting Input", "Inverting Input" and "Output".
You may want to check out more software, such as MathMatic or MemBrain, which might be similar to BoardMaker3.