There are many popular IPTV player plugins available for Enigma2 set-top boxes. Here are some of the most popular options:

1. GStreamer: This is an open-source multimedia framework that integrates with Enigma2 to provide IPTV functionality. It supports a wide range of video formats and is highly customizable.

2. Xcplugin: This is a user-friendly IPTV player plugin for Enigma2 that supports a variety of IPTV sources. It has a built-in EPG and channel list editor, as well as options to customize logos and backgrounds.

3. E2m3u2bouquet: This is a plugin that allows you to import IPTV channels into Enigma2 as bouquets. It supports multiple playlist formats and can automatically update your channel lists.

4. OpenWebif: This is a web-based interface for Enigma2 that includes an IPTV player. It offers an intuitive user interface and supports a variety of media formats.

5. Jedi Maker Xtream: This is an IPTV player plugin that integrates with Xtream Codes, a popular IPTV management platform used by many IPTV providers. It offers a user-friendly interface and supports catch-up TV, VOD, and series playback.

These are just a few of the most popular IPTV players for Enigma2, but there are many other options available. It’s worth exploring different plugins to find the one that best suits your needs and preferences.