Kyght

Tracks the distribution of your installable products. The plugin provides an ajax API to accept installation registrations & usage data. Also provides a mechanism for pushing product upgrades to clients. Custom build tags can also be used to track clients with customized products and push custom upgrades to these clients.
Plugin REST API 
 http://www.yoursite.com/wp-admin/admin-ajax.php
<pre><code>Actions:
 regupdate - Adds\Updates a registration record
 useapp - Updates product\version usage and registered client use
 upgrade - Checks for a product upgrade with a higher version number

Note: Product and Registration records are automatically added\updated via inbound API calls. Only Upgrades are added via the Admin console.

Example (.Net API call to register a client)

 **Registration**
 var response = HttpHelper.Post(URL, new NameValueCollection() {
 { "action", "regupdate" }, 
 { "sky", SecretKey }, //Secret ID must match ID in your WordPress|Settings|InstallTracker 
 { "product", Product },
 { "ver", Version },
 { "custom", Custom },

 { "trackid", RegID }, //TrackID from previous registration to allow updates, blank for new
 { "key", key }, //GUID generated by your installation (Format: 00000000-0000-0000-0000-000000000000 )
 { "name", name },
 { "email", email },
 { "phone", phone },
 { "contact", contact },
 { "addr", address },
 { "city", city },
 { "state", state },
 { "zipcode", zipcode}
 }); 

 var str = System.Text.Encoding.Default.GetString(response);
 if (str != null && str.Equals("0")) return false; //Secret key might not match
 var outObject = JsonConvert.DeserializeObject<Registration>(str);
 if (outObject.valid == "TRUE")
 {
 RegID = outObject.regID; //Returned Registration ID for future updates
 return true;
 } 

 **Usage**
 var pars = new NameValueCollection() {
 { "action", "useapp" }, 
 { "sky", SecretKey }, 
 { "product", Product },
 { "ver", Version },
 { "custom", Custom },

 { "trackid", RegID }, //TrackID from previous registration (optional)
 { "key", key } //GUID generated by your installation (optional)
 };


 **Upgrade**
 var pars = new NameValueCollection() {
 { "action", "upgrade" }, 
 { "sky", SecretKey }, 
 { "product", Product },
 { "ver", Version },
 { "custom", Custom },
 };
</code></pre>
.Net API wrapper client library is available at www.kyght.com (http://www.kyght.com/?page_id=147). 
Other client libraries will be available later on GitHub (https://github.com/kyght/InstallTracker).
.Net client dll Usage
installTrack = new Tracker(\”http://www.yoursite.com/wp-admin/admin-ajax.php\”, \”YourProduct\”, \”2.1.16.80\”, \”666745\”);
<ul>
<li>installTrack.Register(String key, String name, String email, String contact, String phone, String address, String city, String state, String zipcode)</li>
<li>installTrack.Usage(String key, OnTrackerComplete onComplete )</li>
<li>installTrack.UpgradeAvailable(OnUpgradeAvailable onUpgrade)</li>
<li>installTrack.Download(String fileurl, String filename, System.ComponentModel.AsyncCompletedEventHandler onComplete, DownloadProgressChangedEventHandler onProgress)</li>
</ul>

Install Tracker

Tracks the distribution of your installable product. Usage statistics, Registrations and Upgrades.

Dave Ligthart

Simple apache log parser for WordPress. Monitor site usage by ip-address. Adds a dashboard graph widget displaying the daily bandwidth usage.
If you have installed the WP-IP2Nation-Installer the stats will automatically include an extra “country” table column.
Download WP-IP2Nation-Installer here: https://wordpress.org/extend/plugins/wp-ip2nation-installer/

Install Tracker vs WP-Alp