"Micro$oft <3 open $ource"
Open source (OS, also Open $ource) is a capitalist movement, in recent years degraded to a mere brand, forked from the free software movement; it is advocating at least partial "openness", i.e. strategic sharing of design parts with the public and allowing unpaid volunteer contributors from the public to take part in software and hardware development; though technically and legally the definition of open source is mostly identical to free (as in freedom) software, in practice and in spirit it couldn't be more different as for abandoning the goal of freedom and ethics in favor of business (to which ethics is an obstacle), due to which we see open source as inherently evil and recommend following the free software way instead. Richard Stallman, the founder of free software, distances himself from the open source movement. Fascist organizations such as Microsoft and Google, on the other hand, embrace open source (while restraining from using the term free software) and slowly shape it towards their goals. Open source is a short for "yes, it will abuse you, but at least you can read its source code." The term FOSS is sometimes used to refer to both free software and open source without expressing any preference.
Open source unfortunately (but unsurprisingly) became absolutely prevalent over free software as it better serves capitalism and abuse of people, and its followers are more and more hostile towards the free software movement. This is very dangerous, ethics and focus on actual user freedom is replaced by shallow legal definitions that can be bypassed, e.g. by capitalist software and bloat monopoly. In a way open source is capitalism reshaping free software so as to weaken it and eventually make its principles of freedom ineffective. Open source tries to shift the goal posts: more and more it offers only an illusion of some kind of ethics and/or freedom, it pushes towards mere partial openness ("open source" for proprietary platforms), towards high complexity, inclusion of unethical business-centered features (autoupdates, DRM, ...), high interdependency, difficulty of utilizing the rights granted by the license, exclusion of developers with "incorrect" political opinions or bad brand image etc. In practice open source has become something akin a mere brand which is stick to a piece of software to give users with little insight a feeling they're buying into something good -- this is called openwashing. This claim is greatly supported by the fact that corporations such as Microsoft and Google widely embrace open source ("Microsoft <3 open source", the infamous GitHub acquisition etc.).
"Free and Open Source: it is completely FREE OF COST and ALMOST ALL of its components are open source." --GNU/Linux Mint's website already marketing partially proprietary system as "open source" and purposefully misusing the word "free" to mean "gratis" (February 2024)
{ Mint also hilariously markets itself as KISS lol. My friend suggested they only implemented the "stupid" part of it :-) ~drummyfish }
One great difference of open source with respect to free software is that open source doesn't mind proprietary dependencies and only "partially open" projects (see also open core): Windows only programs or games in proprietary engines such as Unity are happily called open source -- this would be impossible in the context of free software because as Richard Stallman says software can only be free if it is free as a whole, it takes a single proprietary line of code to allow abuse of the user. The "open source" communities nowadays absolutely don't care a bit about freedom or ethics (the majority of open source supporting zoomers most likely don't even know there was ever any connection), many "open source" proponents even react aggressively to bringing the idea of ethics up. "Open source" communities use locked, abusive proprietary platforms such as Discord, Google cloud documents and Micro$oft's GitHub to create software and collaborate -- users without Discord and/or GitHub account often aren't even offered a way to contribute, report bugs or ask for support. There are many "open source" projects that are just meant to be part of a mostly proprietary environment, for example the Mangos implementation of World of Warcraft server, which of course has to be used with the proprietary WoW client and with proprietary server assets, which gives Blizzard (the owner of WoW) complete legal control over any server running on such an "open source" server (such servers always only rely on Blizzard temporarily TOLERATING their small noncommercial communities, despite Blizzard having taken some of them down with legal action) -- calling such a project "free software" in this context would just sound laughable, so they rather call it "open source", i.e. "no, there is no freedom, but the source is technically open". Lately you will even see more and more people just calling any software/project "open" as long as some part of its source code is available for viewing on GitHub, no matter the license or any other considerations (see e.g. "open"geofiction etc.).
The open source definition is maintained by the Open Source Initiative (OSI) -- they define what exactly classifies as open source and which licenses are compatible with it. These licenses are mostly the same as those approved by the FSF (even though not 100%). The open source definition is a bit more complex than that of free software, in a nutshell it goes along the lines:
Besides this main legal definition open source is also a cult that comes with its own rituals and ways of thinking, again, mostly harmful ones like embracing update culture which allows the overlords to push something to people and then keep reshaping it silently with "updates" as they're using it (see e.g. the infamous xz incident in Linux).
Open source furthermore greatly fails for example by not accepting CC0 as a valid license and not accepting esoteric programming languages (because they're "obfuscated"). All in all, avoid open source, support free software.
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