No craft beer bars as such, but Valentine's is (was) a popular spot as is the Aubergine Cafe, which is a food place. The Aubergine probably has the best selection of craft beer in town. Both have St. Mel's.
Most of the pubs stock the St Mel's stuff. Valentines has Mcgargles on draft and sometimes other interesting ones like Joker IPA by Williams bros but they might have got that out. Coys bar also has 2 beers by Carrig on draft.
Not been in Aubergine's. Always been closed when I'm in Longford. Only place I've been in that has craft on tap is Coy's. They did have Bo Bristle IPA on tap but got rid of that, so it's just down to 2 Carrig taps (Brazen Amber, can't remember the other one) I did have a bottle St Mel's IPA in there earlier this month and found it undrinkable.
I prefer to go further down the railway line to Mullingar if I'm out for a few craft beers (there's nothing where I live)