IndiaFM (Indiafm.com): First registered in 1998. Now, known as Bollywood Hungama.
IBOS Network (IBOSNetwork.com): First registered in 2002. IIt became defunct post BOI's emergence. The lore is that IBOS's co-founder split from them and created BOI.
Film Information (filminformation.com): Website first registered in 2001.
Box Office India: First registered in 2003.
There were print trade magazines around in the 90s and early 2000s. (The Box Office Report was one) Then, they just stopped since the emergence of internet.