

Zimbra Collaboration Suite
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Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.
Cost / License
- Pay once
- Proprietary
Application typeApplication types
Platforms
- Linux
- Online
- Self-Hosted
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John Coffey added Zimbra Collaboration Suite as alternative to inbuxa- Paul added Zimbra Collaboration Suite as alternative to eigen and Office EU
Paul added Zimbra Collaboration Suite as alternative to Mailflare
maartendra added Zimbra Collaboration Suite as alternative to Email.eu
johnrhee added Zimbra Collaboration Suite as alternative to Workmailify
Danilo Venom added Zimbra Collaboration Suite as alternative to Cloud Mail
ellachoi0811 added Zimbra Collaboration Suite as alternative to Gridie
Paul added Zimbra Collaboration Suite as alternative to LimitPixel
nongatekeeper added Zimbra Collaboration Suite as alternative to LimitPixel- Juri added Zimbra Collaboration Suite as alternative to Nexmail
Featured in Lists
Open-Source Slopware
A list of open-source software containing slop (LLM generated) code or endorses the usage of LLMs in other ways.
This list contains software that obviously accepts irresponsible coding practices or promotes LLM usage. I found these applications while searching for alternatives to previously used software that turned out to contain code generated by slop-machines.
Each of added applications have at least one link that points to the verifiable proof.
This list by no means is meant to cover all the software that contains code by not-so-intelligent tools and people using them but to serve as a reminder to myself about what I have already checked.
Why having LLM generated code (and using generative tools in general) is bad?
Ethical reasons — such as illegally retrieved training material, underpaid workers that prepare the training data.
Impact on environment — increased fossil fuel usage to supply the needed electricity power, water usage in water scarce regions. This somewhat overlaps with the above.
Social impact – noise pollution in neighbourhoods near AI data centres, air pollution from diesel- or gas-powered turbines (also overlaps with the above), resource consumption by data centres drastically increases utility prices.
Impact on brain and thinking, reasoning — by offloading thinking and decision making to machines people are shooting in their foot (more like in their head) as this leads to brain rot. Less intelligent people are easier to control.
Even legal issues (especially in open-source software as it cannot be guaranteed that the “generated” code is not really just re-used, thus unknowingly violating the source license).
Inevitable enshittification — every software product from big technology eventually gets enshittified to maximize revenue. For users this could mean hidden or plain ads, biased opinions/information, privacy violations, increased prices for LLM based tools.
Burden on open-source software maintenance — LLM tools provide easier access to code contributions which often shifts the responsibility of checking code quality from developers to maintainers and reviewers. Digging through walls of merge request text and code generated by slop-machines takes valuable time that otherwise could be spent more meaningfully by fixing bugs and working on new features.
I will try to add links that back up the claims above, but it may take a while.
Of course, I see how and where generative tools could be helpful and sometimes I feel tempted to find an acceptable way to use them, but for now the direct and indirect costs far too much outweigh gains.
This list has its positive counterpart: Slop-Free (Supposedly) Open-Source Software (not quite complete yet).
Also take a look at and give thumbs up to AI Slopfree Software Catalog which contains software dedicated against usage of LLMs.
Also, here is a list of some labels that can be added / voted for so they would eventually appear on application pages:
Slopware;
Slop (LLM) Code;
Slop-Source Software;
Open-Source Slopware;
Contains Slop (LLM Generated) Code.









Comments and Reviews
The school i work at runs it. The webmail is slow, sluggish, looks like it has 20 years, administration is a PAIN, honestly use mailcow, SOGo and maybe Baikal and you've got way enough to work and admin.
The information here is outdated. Zimbra is not freemium/opensource
Zimbra is a company-oriented webmail with contacts manager, calendar, chat, ... Users find it a good alternative to Microsoft Outlook. For administrators, it's a pain.
By its conception, Zimbra is a security risk: all processes run with the "zimbra" system user. The administration Web UI is run by the same java process that provide the Webmail (a Java app hosted by Tomcat), on a different port. All configuration files are owned by the "zimbra" user. If the Web UI is breached, all Zimbra config can be edited.
The configuration is complex, proprietary and unclear. The learning curve is steep, and stay steep even with a good knowledge of used open source software (postfix, sldapd, tomcat, amavis, ...).
Zimbra doesn't follow semantic versioning. Path numbering doesn't reflect breaking changes. Some patches may break the working configuration.
If a webmail provides the same functionalities as Zimbra without its administration Web UI, choose this webmail. Zimbra ease of administration is a false promise that creates more problems than it solves.
Zimbra team does good work, but from the start, its architecture is the issue. In 15 years, this hasn't changed.
It looks to be expensive as no price is listed. You must submit a request for a quote. Didn't look any further into Zimbra.
I have to say this. Pricing is more then reasonable. I am currently testing Zimbra and some alternatives and i must say Zimbra is by far the cheapest with all functions included.
The Open Source Edition is free for you to run on your own server whether on site or hosted.