Sentrifugo is one of the top open-source HRMSs out there. Whether you're a small business or a large organization, it can be configured to fit your exact needs.
Sentrifugo is a free open-source HRMS, which includes an onboarding module in its feature set. If your company is looking for a little bit of everything on top of onboarding, Sentrifugo is a great option. However, because it’s open source you have to save all of your data on your own servers. For a small to medium sized business, that shouldn’t end up being an issue.
Sentrifugo has a support center, an installation guide, a user guide, and a user forum.
Sentrifugo does not support multiple languages.
Sentrifugo is completely free, but you need to take into consideration the cost of hosting it yourself.