Merging GFF3 files?

I have a hunch there is a tool on Galaxy that allows me to do the above, but a scan of the Galaxy Training modules hasn’t come up with anything. Can someone tell me what the tool is that would best do this?

I have one gff3 file with structural annotation output of maker and another that has the functional annotation output of Blast2GO. The latter doesn’t have genomic coordinates or phasing, but the former does. But I would like one file that has both coordinates and attributes (gene names, functions, etc.). Frustratingly, the Blast2GO seems to have renamed the seqid column, so it doesn’t match.

Thanks in advance for any ideas!