There are literally thousands of plugins to choose from in this category, and while a lot of them overlap, and quite a few fulfill almost no purpose whatsoever, there are some that don’t fit in anywhere in the preceding sections but are still worth mentioning. Most of those are related to custom code or are just small quirky things that can spice up a site by outputting the content differently. In other words, this is quite a mix.
#1 SyntaxHighlighter Evolved
SyntaxHighlighter Evolved (wordpress.org/extend/plugins/syntaxhighlighter/):
If you ever need to post chunks of programming code in your posts and on your Pages, from simple HTML to massive chunks of PHP, you know that the built-in parsing will get you in trouble. Sure, there are pastebins and the like, but why not solve this problem by adding the SyntaxHighlighter Evolved plugin, which not only takes care of your precious code but also highlights it accordingly? It is styleable as well, so you can make the code boxes fit your content. Very neat. There are a bunch of other plugins that do similar things, but this one always performs.
#2 Blog Time
Blog Time (coffee2code.com/wp-plugins/blog-time/):
Blog Time outputs the time of the server in timestamp mode, either via a widget or the custom blog_time() template tag. It’s not a clock, it’s just the timestamp, which can be pretty handy sometimes.
Tired of your slack 2D tag cloud? Get one in 3D with WP-Cumulus and its rotating Flash rendition of the tag cloud. Flashy and fun, if nothing else, but I wouldn’t recommend using it as the main navigation tool.
The wpTypography plugin will improve your typography, obviously, which means that it will fix things such as not line-breaking unit values, give you prettier quote marks, dashes, and things like that.
#5 Widget Logic
Widget Logic (wordpress.org/extend/plugins/widget-logic/):
This plugin is as simple as it is brilliant. It adds one tiny little field to every widget, and that field takes conditional tags. That means that you can add checks like is_single() to any widget, which makes the site really simple to make dynamic.
#6 WP Super Cache
WP Super Cache (wordpress.org/extend/plugins/wp-super-cache/):
This is the must-have plugin for any WordPress site experiencing a lot of traffic, but not wanting to go all haywire with the hardware. It lets you set up caching of your site, which means that it will serve static files rather than query the database all the time. If you plan on hitting the front page on Digg with your tech blog and are on a shared hosting account, WP Super Cache will keep you online. It’s a must-have, and better maintained than its predecessor, WP-Cache. The only caveat with WP Super Cache is that it will cache dynamic output as well, which means that your most recent comments may not actually be the most recent ones anymore. You can handle that by controlling what should and shouldn’t be cached, but just be wary of it.
#7 Query Posts
Query Posts (wordpress.org/extend/plugins/query-posts/):
Query Posts is a really cool widget that lets you build your very own WordPress loop in the sidebar, without even having to know any PHP! It can be a very handy way to get custom output in the sidebar, or any other widgetized area really. It integrates nicely with the Get the Image plugin (wordpress.org/ extend/plugins/get-the-image/), which lets you grab an image from the post’s content, a custom field, or even an attachment.
Short and sweet:
Helps to keep your database up to speed, with repairs as well as backing up
Lets you execute PHP code in posts, Pages, and text widgets. Make sure you don’t let anyone who doesn’t know what they’re doing loose with this!
WP-PageNavi ( wordpress.org/extend/plugins/wp-pagenavi/)
Enhances the page navigation feature. Several styling settings are present, but you need to add the plugin’s template tag to your theme files for it to work.