Pages 7 and 8 of the Aardvark Ltd. 1983 catalog feature the inimitable Dave Edson, who wrote a number of machine-language arcade-style games for the TRS-80 Color Computer, most "inspired by" popular coin-ops. Mr. Edson's games have remained in legal circulation, as he has been gracious enough to release the copyright on several of his works; emulator disk images are available at this excellent CoCo resource page.
Page 7 is the first of two pages devoted to the prolific Mr. Edson's work:
Caterpillar is, clearly, an unlicensed version of Atari's Centipede; Tube Frenzy is an original game with resemblances to Targ and Ladybug, and is not an imitation of Tempest as the name might imply; and Venturer is one of the few home computer clones of Exidy's Venture. I bought and played Venturer back in the day -- it didn't have the classic arcade game's music, zoom-in effect, or its variety of monsters, but it had varying treasures and was an acceptable version of one of my favorite old-school arcade games.
Page 8 continues the trend, with games that are apparently "Edson's Best," so presumably better than the ones on the previous page, in case we were thinking about wasting our money on those:
The catalog copy for Planet Raiders takes pains to point out that it is "not just another copy of Defender," which means that it basically is another copy of Defender, with ground bases and a few other new touches. Catch 'Em is a version of Atari's early coin-op Avalanche (which also inspired Activision's Kaboom!); the artwork implies that it has a touch of Midway's Kickman thrown in for personality, but in reality the player just controls a series of horizontal bars that the player must maneuver to intercept falling objects.
Next time, more pages from the distant past...