Individual Books
Alien Secrets (1993)
A young girl from Earth befriends an alien returning home from an exile in slavery and helps him to rescue an important symbol of his people from thieves.
Series
A boy named Richard is recruited to help save Earth from various threats by a small alien named Aric, who arrives at his house in free samples of food. By Stephanie Spinner and Jonathan Etra. 1988-1994.
Dinotopia is an island where humans and dinosaurs live together. 1992-2007.
The Plant That Ate Dirty Socks Series
Michael and his brother Norman grow a pair of sock-eating plants. By Nancy McArthur. 1988-1999.
Based on the Star Trek television series. Focuses on Spock, McCoy, and Kirk during their Academy years. Written by different authors. 1996.
Tom Swift
The science fiction adventures of a boy inventor named Tom Swift. This series was released in several sub-series, some of which focused on the son of the original Tom Swift, Tom Swift, Jr. Some of the later series leave it vague whether the boy in the series is Tom Swift, Jr. or possibly the grandson of the original Tom Swift. The original Tom Swift series was written and published 1910-1941. Later series were released 1954-1971, 1981-1984, 1991-1993, 2006-2007, 2019. A Stratemeyer Syndicate series.
Jestress's Forgotten Books and Stories 