Glenn Ansley

This plugin gives multiple developers on a live site the ability to notify other if they are currently hacking any files. The notification is displayed on the front end in a draggable block for anyone logged in as an administrator. You may easily add hackers to the list or delete them via the wp-admin area.

Who's Hacking What?

A simple interface that notifies other administrators if you are hacking files on a live server.

Yannick Lefebvre

The purpose of this plugin is to allow users to create one or more modal dialog(s) / pop-up window(s) that will appear when a user visits their site. The number of times that these can load is configurable. They can load content from external sites or custom HTML code into the dialog. This plugin can be used to invite people to register to a newsletter, respond to a survey, or simply welcome come to a site upon their first visit.
You can try it out in a temporary copy of WordPress <a href="https://demo.tastewp.com/modal-dialog" rel="nofollow ugc">here</a>.

Modal Dialog

The others either didn't work or caused massive JavaScript problems, breaking other plugins.

This plugin worked the best.

Worked better than the others

The purpose of this plugin is to allow users to create one or more modal dialog(s) / pop-up window(s) that will appear when a user visits their site.

Who's Hacking What? vs Modal Dialog