Textile 2
A plugin that enhance your entry's text formatting functionality.

PreviousNextInCategory
A plugin that adds two container tags, <MTEntryPreviousInCategory> and <MTEntryNextInCategory> that work just like the <MTEntryPrevious> and <MTEntryNext> tags.

Arithmetic
Setting variables with other MT tags as values, and incrementing variables

Category
Allows access to category archive tags from individual entries

CategoryOfArchive
Used on gallery pages to access data in the Category Description field, and other category tags

Collate
Grab latest entries from each category, then sort categories by most-recently-updated

Collect
Collect width and height attributes of <img> to determine orientation

Compare
Used programmatically for if/then statements and general comparisons

DirifyPlus
More advanced options for auto-dirifying, including use of dashes instead of underscores

Entry
Singles out one entry ID to use that entry entry's image for Index and Title pages

Expressions
Required by Arithmetic plugin

FilterCategories
Used to exclude “Favorites” category from index/archive pages in my Photo Album

FirstNWords
Summaries of Most Recent Galleries on index page in my Photo Album

Grid
Group index and archive listings by threes and construct my category page using the tag <table>

KeyValues
Meta data for each gallery (category description field) in my Photo Album.

PreviousNextInCategory
Ability to go forward or backward within the same category

RelativeURL
Eliminate host/domain from certain file paths

Related Entries
Display entries that are in the same category as the current entry.