Add more software (#19)

* Add a new page about other modelling software

* add more modelling software

* add more software

* Revert "add more software"

This reverts commit 0b9bf6c.

docs/other_software.md

@@ -1,14 +1,17 @@
 # Other software
 
-Other software that provides acoustic scattering models of relevance to fisheries and plankton acoustics include:
+Other software that provides source code for acoustic scattering models of relevance to fisheries and plankton acoustics includes:
 
 - [acousticTS](https://github.com/brandynlucca/acousticTS): R code for calculating scattering using the DCM, DWBA, SDWBA, SDWBA_curved, KRM, MSS model, as well as that of calibration spheres.
 - [Coupled BEM acoustic](https://github.com/elavia/coupled_bem_acoustic): Julia code that calculates the TS of three-dimensional shapes with an included object (e.g., a swimbladder).
 - [scatmod](https://github.com/SvenGastauer/scatmod): Open source acoustic scattering models for fisheries acoustics. Python and R code for fluid spheres and calibration spheres.
 - [FishAcoustics](https://github.com/gavinmacaulay/FishAcoustics): Contains a Python module that implements the phase-tracking DWBA model.
 - [KRM Model](https://www.fisheries.noaa.gov/data-tools/krm-model): A web page that uses the KRM model to estimate the TS of predefined or user-supplied shapes over a range of input parameters.
+- [KRMr](https://github.com/SvenGastauer/KRMr): KRM model for fish in R. 
+- [Liquid spheroid](https://github.com/elavia/liquid_spheroid): Julia and C++ code to calculate the scattering by fluid prolate and oblate spheroids.
 - [SDWBA Model](https://www.fisheries.noaa.gov/data-tools/sdwba-model): A web page that uses the SDWBA model to estimate the TS of predefined shapes over a range of input parameters.
 - [SDWBA_TS](https://github.com/ccamlr/SDWBA_TS): Matlab code that implements the SDWBA model for Antarctic krill.
 - [sphereTS](https://github.com/gavinmacaulay/SphereTS): Python code to calculate the TS of calibration spheres.
 - [Standard sphere target strength calculator](https://www.fisheries.noaa.gov/data-tools/standard-sphere-target-strength-calculator): A web page that calculates the TS of calibration spheres.
+- [tetrascatt](https://github.com/cran/tetrascatt/tree/master): R and C++ code that implements the DWBA model on arbitrary geometries.
 - [ZooScatR](https://github.com/AustralianAntarcticDivision/ZooScatR): R code that implements the DWBA model.