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gdstk

Gdstk (GDSII Tool Kit) is a C++/Python library for creation and manipulation of GDSII and OASIS files.

gdspy

Python module for creating GDSII stream files, usually CAD layouts.

librosette

A fast, intelligent, and accessible layout editor

splayout

Silicon Photonics Design Tools.

gdshelpers

A simple Python package for creating or reading GDSII/OASIS layout files.

gdschamfer

Python add-on module for gdspy that can perform chamfering operation on GDSII files

openroad

OpenROAD's unified application implementing an RTL-to-GDS Flow. Documentation at https://openroad.readthedocs.io/en/latest/

ldesign

Layout design tool for superconducting circuits based on gdstk.