Absolutely. There are a number of websites out there that still publish modules, monsters and content of classic D&D. Most refer to it as OSR - Old School Role-playing.
Here are 2 sites to get you started:
Dragons Foot: http://www.dragonsfoot.org/ A lot of content here especially modules and creatures.
The Mad Irishman: http://www.mad-irishman.net/pub_dnd_1e.html This site has great replicas of the original character and DM sheets.
Dragons Foot: A lot of content here especially modules and creatures.
The Mad Irishman: This site has great replicas of the original character and DM sheets.
Try these, I don't think you will be disappointed.