Update README.md

README.md

@@ -45,3 +45,16 @@ open data sets for machine learning pertaining to porous materials.
 # other data sets, pertaining to materials, for machine learning
 
 see `matminer` [here](https://hackingmaterials.lbl.gov/matminer/dataset_summary.html). pointed out by [Jack Evans](https://twitter.com/jackevansADL/status/1439730395570851841).
+
+# construct your own crystal structures!
+here is a list of open-source codes for building your own crystal structure models.
+
+|   name of code  | link to code | link to associated paper |
+| -- | -- | -- |
+| `tobacco` | [link](https://github.com/tobacco-mofs/tobacco_3.0) | [link](https://pubs.acs.org/doi/abs/10.1021/acs.cgd.7b00848) |
+| `pormake` | [link](https://github.com/Sangwon91/PORMAKE) | [link](https://pubs.acs.org/doi/full/10.1021/acsami.1c02471) |
+| `ToBasCCo` | [link](https://github.com/peteboyd/tobascco) | [link](https://www.nature.com/articles/s41586-019-1798-7?proof=tNature) |
+| `Zeo++` | [link](http://www.zeoplusplus.org/) | [link](https://pubs.acs.org/doi/abs/10.1021/cg500158c) |
+| `stk` | [link](https://aip.scitation.org/doi/10.1063/5.0049708) | [link](https://github.com/lukasturcani/stk) |
+| `PoreMatMode.jl` (only modifies) | [link](https://github.com/SimonEnsemble/PoreMatMod.jl) | coming soon! |
+