This site demonstrates the oik-external-link-warning plugin.

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Plugin name and description Plugin links Version, total downloads, last update, tested
oik external link warning
produce a warning when clicking on or hovering over an external link or when clicking on a mailto link By bobbingwide.
oik external link warning 1.0.0-alpha.0503

2016-05-03
4.5.1

oik tunes
Record catalogue – recordings and tracks By bobbingwide.
oik tunes 0.1.0314

2013-03-28
3.5.1