Generali is building a flexible insurance policy administration system. See the site on PVS2, our meta policy administration system.
agens: Helped build the Phoenix-Life (now VIS) package. They are also great experts in product modeling and sell VP/MS, a nice insurance product modeling system.
There was a spin-off from M+I, called innovative tools, which produces a product server called Promos which has roots based on VP/MS
ID Software: they build a system called IVVR (or vieAss) which is in broad use and a best selling standard package for medium sized insurers in Germany and eastern europe.
msg AG cooperates with SAP and they also have a product modelling system called FS/PM
Euroforum: The makers of Handelsblatt-Tagung for the German insurance industry. Very impressive service!
IIR: Offer also many events for the insurance industry
MCC consulting - another one
Ueberreuther - Wirtschaftsseminare - look for their seminar pages on insurance
are specializing in J2EE, WebSphere and Insurances - interesting combination
see some of their articles
SAP Insurance: Offer a "Cash Disbursement and Collection" package for the insurance industry. More to come.
IBM - Insurance: Known for their IAA architecture
T-Systems // Insurance: Known for their ICIS architecture
CSC Ploenzke: Big system integrator
Mummert & Partner: yet another system integrator
and there are many many more ... see e.g. the directory by FH Köln