Spiceworks (spiceworks.com/free-help-desk-software) is a cloud based help desk that's completely free with no restrictions. Reviews: https://www.fool.com/the-ascent/small-business/it-management/spiceworks-review/, https://www.pcmag.com/reviews/spiceworks-cloud-help-desk, https://www.gartner.com/reviews/market/it-infrastructure-and-operations-management-others/vendor/spiceworks/product/spiceworks-help-desk
Zendesk (https://www.zendesk.com/) is the most popular help desk software used by anyone from small businesses to Fortune 100 corporations. Reviews: https://www.pcmag.com/reviews/zendesk-support, https://www.gartner.com/reviews/market/crm-customer-engagement-center/vendor/zendesk/product/zendesk-suite, https://www.capterra.com/p/164283/Zendesk/reviews/
Jira (https://www.atlassian.com/software/jira) is an all-in-one customer service, ticketing and issue tracking solution. Reviews: https://www.softwareadvice.com/project-management/atlassian-jira-profile/, https://www.g2.com/products/jira/reviews, https://www.gartner.com/reviews/market/application-development-life-cycle-management/vendor/atlassian/product/atlassian-software
HappyFox (https://www.happyfox.com/) is an online ticket manager similar to Zendesk but simpler. Reviews: https://www.pcmag.com/reviews/happyfox, https://www.g2.com/products/happyfox/reviews, https://www.softwareadvice.com/help-desk/happyfox-profile/
Freshdesk (https://www.freshworks.com/freshdesk/) is cloud-based customer service software with a free tier for smaller businesses. Reviews: https://www.g2.com/products/freshdesk/reviews, https://www.pcmag.com/reviews/freshdesk, https://www.gartner.com/reviews/market/crm-customer-engagement-center/vendor/freshworks/product/freshdesk-omnichannel

Please note that as an AI model I don't have real-time access to the Internet, so these links might be outdated or broken.
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