Original: Various spin-off series were written by Stine: Goosebumps Series 2000, Give Yourself Goosebumps, Tales to Give You Goosebumps, Goosebumps Triple Header and Goosebumps HorrorLand. Another series, Goosebumps Gold, was never released.
Simplified: After the series, many different spinoffs were made, also written by Stine, including Give Yourself Goosebumps and Goosebumps: Series 2000 which appeared in 1995 and 1998.