One question always gets asked over and over again on the forums... "What Bukkit plugins work well with Tekkit?!" Well, that's what this thread is for. In here you can post your personal experiences with certain Bukkit plugins and recommendations as to which ones to use. Think of it as a mini-review compilation.
Keep it related to Tekkit in the sense that we don't need to know what chat adjustment mods work and how well they work. This should be reserved for major gameplay overhaul plugins like Terrain Generation, Multiverse, RPG Plugins, etc.
To keep everything organized you should use the following format:
Plugin Name: Just the name of the plugin
BukkitDev Link: The link to the BukkitDev page
Description: A short description of what the plugin does
Tekkit Compatibility: How compatible it is with Tekkit. Don't be afraid to also post fixes to common problems associated with this plugin! Be sure to clarify whether or not the plugin works well with mod blocks or not.
After this thread builds up a bit I will start adding the highly recommended plugins into the OP so this can be a one-stop shop for people looking for quality Bukkit plugins.
I'll kick things off!
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Plugin Name: Transporter
BukkitDev Link: http://dev.bukkit.org/server-mods/transporter/
Description: Create completely customizable warp gates to teleport players across your world or even across multiple servers!
Tekkit Compatibility: As of Tekkit 3.1.2 the Transporter client patch is now directly integrated with Tekkit and you can teleport players across multiple servers seamlessly. I have personally tested it and can say it works flawlessly. It even teleports players inventories! (This can be disabled) Works just fine with bringing over mod blocks as well.