WoW API: GetAddOnInfo

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Get information about an AddOn.

name, title, notes, enabled, loadable, reason, security = GetAddOnInfo(index or "name")

Parameters

(index or "name")

index: Integer - The index of the AddOn in the user's AddOn list. Note that you cannot access Blizzard-provided AddOns through this mechanism.
name: String - The name of the AddOn to be queried. You can access Blizzard-provided AddOns through this mechanism.

name, title, notes, enabled, loadable, reason, security

name: String - The name of the AddOn (the folder name).
title: String - The title of the AddOn as listed in the .toc file (presumably this is the appropriate localized one).
notes: String - The notes about the AddOn from its .toc file (presumably this is the appropriate localized one).
enabled: Flag - Indicates if the AddOn is currently enabled, 1 if it is, nil if it is not.
loadable: Flag - Indicates if the AddOn is eligible to be loaded, 1 if it is, nil if it is not. Currently returns 1 if the addon is LoadOnDemand in the .toc file or if the addon is already loaded.
reason: String - The reason why the AddOn cannot be loaded. This is nil if the addon is loadable or already loaded, otherwise it contains a code indicating the reason. (Observed reason codes: "DISABLED", "MISSING", "INTERFACE_VERSION")
security: String - Indicates the security status of the AddOn. This is currently "INSECURE" for all user provided addons and "SECURE" for Blizzard_* AddOns.

If the function is passed a string, name will always be the value passed, so check if reason equals "MISSING" to find out if an addon exists.
index or "name" is not case sensitive, at least not on Windows.
If the function is passed a number that is out of range, you will get an error message, specifically [<file name>]:<line number> AddOn index must be in the range of 1 to <GetNumAddOns()>