Applications that use external sources:
+-------------+---------------------+--------+---------------------------+
|   Category  |      Program ID     | Method |        Source File        |
+-------------+---------------------+--------+---------------------------+
| Accessories |        enpass       | manual |        enpass.list        |
|    Games    |       steam32       | manual |         steam.list        |
|    Games    |       steam64       | manual |         steam.list        |
|   Internet  |        btsync       | manual |        btsync.list        |
|   Internet  |       dropbox       | manual |        dropbox.list       |
|   Internet  |    google-chrome    | manual |     google-chrome.list    |
|   Internet  | google-musicmanager | manual |  google-musicmanager.list |
|   Internet  |  google-talkplugin  | manual |   google-talkplugin.list  |
|   Internet  |        insync       | manual |        insync.list        |
|   Internet  |    opera-browser    | manual |     opera-stable.list     |
|   Internet  |   owncloud-client   | manual |    owncloud-client.list   |
|   Internet  |     spideroakone    | manual |     spideroakone.list     |
|   Internet  |      syncthing      | manual |       syncthing.list      |
|   Internet  |       vivaldi       | manual |        vivaldi.list       |
|    Media    |      libdvdcss2     | manual |      libdvdcss2.list      |
|    Media    |     nuvolaplayer    | manual | tiliado-nuvolaplayer.list |
|    Media    |       spotify       | manual |        spotify.list       |
|   Servers   |         emby        | manual |      emby-server.list     |
|   SysTools  |      virtualbox     | manual |      virtualbox.list      |
+-------------+---------------------+--------+---------------------------+