Hm, not sure how much it counts but both SCE Ishtar Rising (1 and 2) and A Time to Sow mention Seyetik... Just looked it up. First one just says his hologram was used. Second has Geordi familiar with his terraforming work.
There was a USS Seyetik mentioned in Titan, Blue Horizon was mentioned in Deny Thy Father, "Andorian tuber root" got a few mentions in novels and comics, the Prometheus either appeared or was mentioned in Bridge Commander and the Runners constellation was mentioned in Twilight.
All this continuity knowledge warms the Nasat's heart. Funnily enough, Halanans have never appeared or been mentioned again, as far as I know.
^ I actually liked the premise of the Halanan telepathy. Hard to work into a novel though. Given the amount of aliens on Titan from DS9 and TNG species, I'm surprised no Halanan character has appeared in that series.
The Halanan race was used in the fan production Star Trek: Helena Chronicles and Star Trek: Odyssey, made by the same people that did Star Trek: Hidden Frontier.