Naoki Takahashi's `NScripter' is a popular Japanese game engine used for both commercial and free visual novels.  It attained popularity due to its liberal terms of use and relative simplicity.  However, it is closed source...

Load your weapons and Open Fire! From BlueTorch Studios and BlueGill Flame Game Studios comes an exciting top-down military shoot-'em-up that will have you uncontrollably wasting hours of precious time. Featuring seamless,...

Oil Tycoon is a game where you are the head of a oil company and you can dig, sell oil, and buy tankers to transport it.  But beware!  An unlucky spot to dog may mean salt water instead of oil, or a crashed tanker and thousands of dollars...

Osmos is a game where the player controls a substance in an enclosed environment, reminiscent of flOw. By touching smaller objects, they can be absorbed, merging to create a larger substance. The substance is controlled through the mouse...

The objective of Oilcap Pro is to keep the oil flowing for as long as possible by placing down pipe links to direct its flow. Registration Information: Click the QUIT button then on the Order Form screen type the '$'...

On The Contrary is a puzzle point and click game from 1984 in which you have to open doors by clicking on them and match pairs of objects to accumulate money (score) while avoiding the bandit which, if found without the matching detective in a turn,...

Otiru means “to fall from a height” in Japanese. Select New Game from the File menu. You will start up in the air, outside the playfield, pointing to it. You will immdiately begin moving in some direction.

O.G.R.E. is a turn based, armed warfare tactical/strategic combat game against the Mac's AI.  The plot is in the year 2087.  

Flight simulators seem to fall into two categories: jet-powered shoot-’em-ups with miraculous capabilities that can save the day in any situation, and more realistic seat-of-the-pants simulations that require real aviation skills and tactical...

One on One is a basketball simulation game for very early Macintosh.  Altough it's B&W, One on One features realistic sound effects and original gameplay.  You control your character using the mouse and jump to shoot (or to block)...

In the wake of the space shuttle Challenger tragedy, a new awareness of the space program has arisen, one that deals with the purpose of space exploration, and with understanding the technology that is being used for the task. Orbiter is a personal...