https://dab.genomefoundry.org/design_assemblies

EGF Design and Build is a project of the Edinburgh Genome Foundry to simplify the discovery and use of different assembly standards (such as EMMA, MoClo, Cyanogate), and to provide a simple portal to order constructs from the Foundry.

EGF DAB is open source and the code is on Github. It is part of the EGF Codons collection of open-source software for DNA assembly and Synthetic Biology.
https://edinburgh-genome-foundry.github.io/