Speleo Apks

The apk sizes and md5 are listed also on TopoDroid site (speleoapps).
Apks marked as "Beta" are unstable.
Before installing an apk on your Android verify that it has the proper size and md5.
Get the apk from here, and size/md5 from TopoDroid sitepage https://sites.google.com/site/speleoapps/home/speleoapks, which should coincide with the values on this page.

TopoDroid apks.
Cave3D apks.
Proj4 apks.
Naso++ apks (incloding NasoUpload).