Download of ThinkingParticles 4.0 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This program is an intellectual property of cebas VISUAL TECHNOLOGY Inc. We recommend checking the downloaded files with any free antivirus. ThinkingParticles lies within Photo & Graphics Tools, more precisely 3D Design. The following versions: 4.0 and 3.0 are the most frequently downloaded ones by the program users.
From the developer:
thinkingParticles™ is a completely new class of rule-based particle systems for 3ds Max and 3ds Max Design. When this type of particle system is compared to an event-based particle system, (which works on triggers and time dependent events) you'll find many unique advantages within TP3's rule-based logic, which is free from normal time-based constraints and instead, applies simple behaviors.
You may want to check out more software, such as Plate 'n' Sheet Development Pro., CAD To DMC or TachyCAD, which might be related to ThinkingParticles.