Blood, that fantastically demented FPS has made it to GoG and includes both Cryptic Passage and the Plasma Pak. It runs in DosBOX but you won't have to worry about that as the download is already configured. What you may want to do though is grab a little utility called Yang that sets up an All Seeing Eye/QuakeWorld type multiplayer connector. It currently needs some tweaking for the GoG version, but the intrepid Forumers will likely find other solutions as well.
The game is currently priced at $5.99 USD. You can read more of my ramblings on Blood here which includes some third party mentions.