SPAdes

short reads assembler
http://bioinf.spbau.ru/spades

MEGAHIT

for assembling large and complex metagenomics data
https://github.com/voutcn/megahit
MEGAHIT: an ultra-fast single-node solution for large and complex metagenomics assembly via succinct de Bruijn graph

SSPACE

Scaffolding pre-assembled contigs using SSPACE
SSPACE-LongRead: scaffolding bacterial draft genomes using long read sequence information.
http://www.baseclear.com/bioinformatics-tools

Velvet

Fast assembler for small genomes
https://github.com/dzerbino/velvet

SOAPdenovo

Designed for assembling large plant and animal genomes
http://soap.genomics.org.cn/soapdenovo.html

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read more
https://en.wikipedia.org/wiki/Sequence_assembly