RASER (Reads Aligner for SNPs and Editing sites of RNA) is a short-read aligner with high accuracy, suitable for applications where SNPs, RNA editing sites or other types of small variants are sought after in RNA-Seq data sets.
You can download source code and manual of RASER in the release menu of this page, or at https://www.ibp.ucla.edu/research/xiao/RASER.html
You can also download pre-built index files at https://www.ibp.ucla.edu/research/xiao/RASER.html