usage.md

+# As a coupling library
+- [ICON-ESM](https://mpimet.mpg.de/en/communication/news/icon-esm-mpi-ms-next-generation-earth-system-model)
+  - ICON-Atmosphere (NWP or AES) <-> ICON-Ocean
+  - ICON-Atmosphere (NWP) <-> ICON-Waves
+  - ICON-Output
+  - [HD Model](https://nat-esm-system.dkrz.de/Optional%20Components/HD%20Model.html)
+    - ICON-A (NWP) -> HD
+  - [Parflow](https://parflow.org/)
+  - [mHM](https://mhm-ufz.org/)
+  - [CoCip](https://elib.dlr.de/68002/1/Schumann_CoCiP_TAC2_DLR_FB_2010_10_p_69_74.pdf) (Contrail Cirrus Prediction Tool)
+  - YACO (output server for ICON)
+  - [HIOPY](https://tobi.pages.gwdg.de/natesm2023/#/title-slide) (output server using healpix grid)
+  - aero(o3-provider (input server)
+    - aeroo3-provider -> ICON-A
+  - WIP: [FESOM](https://fesom.de/)
+  - WIP: [CLEO](https://github.com/yoctoyotta1024/CLEO)
+- [HIRHAM-NAOSIM](https://klimanavigator.eu/dossier/artikel/037343/index.php)
+# As an interpolation library
+  - [PISM](https://www.pism.io/) (Parallel Ice Sheet Model)
+    - for regridding of input data
+  - OASIS3-MCT (since version 6.0)
+    - for online weight computation
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