The maps plugin is mostly explained by its name – you put a shortcode on your page/post and it loads a map there for you. I like it because of the ease of telling what the map should be showing, as well as being able to load in your own custom marker, which is a nice touch.
The Custom Gallery Link is the plugin I’m more excited about though. It is exceedingly useful if you use the WordPress built in gallery feature. This is because it adds an extra field in an image’s media area (where you alter the title, alt text, caption, etc) that lets you set a custom url, whereas before it would only link to either the image’s own page or its attachment page.
I’m glad that it’s a plugin now too, as before you had to go into your theme’s functions file and add the code yourself. Not that I mind doing something like that, but this makes it easier for those who don’t like digging into php!
Hopefully you get some use out of this. Enjoy!