D. melanogaster have an unusual retrotransposon mediated method of telomere maintenance (http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2099598/). This mechanism is arguably akin to telomerase.
Telomeres *may* also be elongated via a rolling circle mechanism using t-circles. I am not well read on the literature anymore, and I'm not sure how well supported this model is in vivo. Also, these circles and this method of elongation are akin to other more cannonical means of HR-mediated telomere elongation. (http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4041010/)
It's up to interpretation whether these mechanisms fall under what you'd consider 'telomerase' or 'HR'.