For WDL questions, see the WDL specification and WDL docs.
For Cromwell questions, see the Cromwell docs and please post any issues on Github.
Is there a central repository where one can look at pre-existing WDLs to see if they meet a need? For context, I'm trying to find some WDLs that may implement some splitting/merging of fastq and/or BAM files for parallel processing. I'm looking to try and implement the idea for both BWA alignments and Haplotype calling.