Index: README.md
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 - MTT uses and generates `.m` files for [GNU Octave](https://www.octave.org/).
 - MTT is mainly built on the [GNU](https://gnu.org/) set of tools.
 - MTT uses the algebraic package [REDUCE](https://reduce-algebra.sourceforge.io/).
 - MTT is based on the bond graph language; general bond graph information is available from [The Bond Graph Compendium](https://www2.engr.arizona.edu/~cellier/bg.html) homepage.
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+
+## Availability
+
+- [GitHub](https://github.com/reduce-algebra/mtt)
+- [SourceHut](https://git.sr.ht/~trn/mtt)
+- [Chisel](https://chiselapp.com/user/reduce-algebra/repository/mtt)
+- [Sourceforge](http://mtt.sf.net) *(Archived)*
+
+----
 
 ## Authors
 
 - [Peter Gawthrop](http://www.gawthrop.net/) [\<peter.gawthrop@unimelb.edu.au\>](mailto:peter.gawthrop@unimelb.edu.au)
 - [Geraint Paul Bevan](https://www.gcu.ac.uk/cebe/staff/geraint%20bevan/) [\<Geraint.Bevan@gcu.ac.uk\>](mailto:Geraint.Bevan@gcu.ac.uk)
   - [Alternate Contact](https://www.enchant.me.uk/) [\<geraint@enchant.me.uk\>](mailto:geraint@enchant.me.uk)
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