Original: In 2005, Adobe Systems acquired Macromedia; subsequently, in 2007, Adobe Flash CS3 Professional, the next version of Macromedia Flash was released.
Simplified: FutureSplash along with Flash were soon bought by Macromedia around 1997, who in December 2005 was again bought by Adobe Systems. From Flash version 2 to 8 it was called "Macromedia Flash", now it is called "Adobe Flash".