JSN Extension Framework 2: Git Link
JSN Extension Framework 1: Git Link
JSN PageBuilder 4: Git Link
JSN PowerAdmin 2: Git Link
JSN Uniform: Git Link
As for the rest, we are still working on them. We hope they will be available for free on GitHub as soon as possible.
Note: You need to download and install JSN Extension Framework before installing the others (Gen 2 for JSN PageBuilder4 and JSN PowerAdmin 2. Gen 1 for JSN Uniform).
ALL THESE PACKAGES ARE COMPATIBLE WITH JOOMLA 3 ONLY.
It is strongly recommended to backup your site, then install these packages in that backup for testing before installing them on the production sites.