AFAIK there is no tool for the onboard zipped backups.

But you could do the following:
unzip the comm_and_cal.zip
goto directory Root/home/user

for contacts:
cd to .osso-abook-backup/db
load the file addressbook.db into a text editor and at least you will see your contact info
You may write a script to extract the vcf card info from that proprietary db format

for SMS:
cd to .rtcom-eventlogger
untar the file backup.tgz
load the el-v1.db into a sqlite3 editor and you may extract SMS via SQL