Celera Assembler : scientific software for biological research. Celera Assembler is a de novo whole-genome shotgun (WGS) DNA sequence assembler. It reconstructs long sequences of genomic DNA from fragmentary data produced by whole-genome shotgun sequencing. It' a whole genome assembler originally developed at Celera Genomics for the assembly of the human genome. CeleraAssembler is now an open-source project at SourceForge. The code is actively maintained by researchers at CBCB and the Venter Institute (formerly known as TIGR, The Institute for Genomic Research). Registration not required.