significant SNPs to annotated candidate genes
You can use BEDOPS' closest-features tool. You only need to have the SNPs coordinates in .bed format and a .bed file with gene locations. BEDOPS will look for the closest genes upstream and downstream of your SNPs. The command will look something like this: 

closest-features yourSNPs.bed yourAnnotation.bed


Then, you can obtain your functional annotations through different tools such as biomart.