The plugins from WP Online Support are well designed and work very well. Their plugins are also well documented and they give good support. If you are looking for a good gallery or slider plugin for your testimonials, client logo carousel, portfolio or other featured content, they provide it all.
PowerPack is their latest addition. It combines the most used plugins for featured content into one pack, that you can manage from a central point in your WP admin. You can just activate only the modules that you want to use. Comes with simple to use shortcodes, with lots of parameters. The front-end result is nice and clean, and fully responsive.
To give you a good example, just take a look at the portfolio demo: lots of different designs, with inline and popup style for the project summary, with a nice image gallery included. For most cases this will be enough, but you can also add a link to a project page if you need more space for explaining and showing a more complex project.
Pricing is also very reasonable and they offer nice bundle prices, also developer licenses with one-time-payment and lifetime updates.