I think that would be totally appropriate to let people here know that these are for sale if you're up for the labor of shipping some of them out (or give a local pickup option). Posting what you are selling or giving away in places like Facebook Marketplace (if you use that) can help too. And since you have a lot of programming manuals, you might post on programming related forums or groups if you're part of any of those, even if the group is not focused on vintage software/hardware.
At least from a collector and financial value standpoint, I think there is more demand for computer magazines than programming language manuals (more pictures, nostalgia blast, easy to read for entertainment, etc) - though I've offered programming manuals from the 80s/90s before for nominal amounts or free, and was able to sell/give many of them away without a lot of trouble. For me it was less about making money, and just finding a way to connect the books to people that might still be interested in them, saving them from the landfill or recycling. I think there was more demand for stuff related to C/C++ and assembly compared to other things.
