tools for user account management for solaris and linux platforms

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http://serverfault.com – we have a setup consisting of 60+ hosts (solaris and linux). we would like to develop/install a tool that helps us with passwd resets, account creation/deletion, and other common user account mgmt tasks. we have looked at webmin , puppet and AD-integration as potential solutions. but either they are too expensive, have too many holes (vulnerabilities) or our architecture does not permit such a deployment. so we are still looking. our requirements are - 1. free and preferably oss. 2. doesn't need to have a web UI. could be a simple library/api that we can use to script up a user mgmt tool. 3 (HowTos)