Question : What tool do you use to manage 100+ oracle databases

I need to manage a few databases, amongst them 100+ oracle databases.

Nearly all the tools I come across are good to look at 1 database.
These tools work fine if you have 1,2,3,4 ... up to 10, but then it starts getting ugly

I need a very highlevel view of all the databases.
Some are standalone, but some have a physical standby, drc, etc
So i need some kind of grouping too.

Before programming my own solution for this, (it's worldwide)
Does anybody have any good tools for this ?
Or any pointers ?

What i am interested in:
Status
Backups
Standby lag time
Disc Free space
Tablespace Free space
Etc

I know EM exists, but i don't think it's adequate for the high level view

I'm currently working on a solution which would consists of local services gathering info in the local LAN about those database
These report back to a central location and from there provide the info using a webserver
I've come to point realising this is a massive amount of work :)
But I need it anyway, and some good pointers or tools are allways welcome.

I'm actually trying to build a diagram with databases and just indicators of where to look for problems
So I don't waste my time looking at databases where everything is ok.

Answer : What tool do you use to manage 100+ oracle databases

Normally you should do this using scripting where all warning / error/ problem/messages

whenever and if they occur,  would be sent to you with the db id and the neccesary info.