Are there any tools/ ant tasks that could be integrated into the ant build file to build Symbian applications? Similar to what we have for Android (AndroidAnt), BlackBerry (BB Ant Tools), .NET (Nant)
There isn't any officially supported stuff as far as I know, but (having done it myself) I know it is perfectly possible to build Symbian apps using Ant by simply calling the command line tools from ant commands.
If this is a precursor to automatically building symbian apps using a build server of some description, remember that Symbian builds have an annoying habit of polluting the build environment so you will need to invest some time into automated environment cleaning and environment setup.