
Current version: 2.0
Spawner Pro, is an updated feature enhanced version of Spawner. It makes spawning enemy units easier and now supports more of them for each level. It is extendible and highly documented to allow it to be adjusted to your project with ease.
Unity Version: 3.4.1 Free
Price: $20
Source Code: C#
Asset Store Link
Documentation Link
Webplayer Demo
Changelog:
Version 2.0
- Fixed bugs with Unity 4.*
- Added ability to set whether locations are spawned at randomly or in order
- Moved over to a different implementation for spawn modes. Spawn modes are now separate classes to allow easier extending of spawn modes (At the cost of dynamic changes at runtime at present)
Version 1.0.3
- New custom inspectors and editors
- Multiple spawn locations per a spawner (selected at random on unit spawning)
- Multiple units per a unit level (selected at random on unit spawn)
- Coded to work with namespaces in Unity 4.0, works as normal in Unity 3.*
- Lots of small changes to try and improve performance and to stop feeding the GC monster
Tutorial - Outdated from version 2.0
Pictures

Inspector

Unit Editor

Wave Editor
Regards,
Garth