DupRadar
Dupradar is a sophisticated tool that allows for the examination of the duplication rate present in samples.
Made by Sergi Sayols, here is the link to the publication article.
For RNA-seq data, DupRadar is used in "part 5 statistics". The data used by DupRadar are the aligned reads to estimate the level of duplications for each sampler.
Figure 1 : simplified RNAseq pipeline.