Many systems require you to have some technical development skills within your enterprise in order to configure, extend, and support the systems. You'll want to make sure that the system technology matches the technical skillsets available to you.
Some enterprises have appetites for open source and others do not. Remember, there are multiple flavors of open source. Some open source projects are backed by a commercial company and others are purely community driven.
Some enterprises insist that software be installed on their own servers behind the firewall. Others prefer a cloud model where software is hosted and supported by the vendor, a public cloud provider, or another partner.
If you don't want to consider vendors who are not active in your region of the world (Americas, EMEA, or Asia-Pac), then limit your choices below. Note that you will always see vendors with a "Global" footprint regardless.
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