
There are so many organizations and people that I could mention, but in order to keep this relatively brief, I'll limit it to a few groups:
- Simon Carless and UBM
- The organizers of festivals, jams, and local events
- Platform holders
- Other helpful developers
- Press, YouTubers, and streamers
I think of Simon Carless as the godfather of independent gaming. Check out his mind boggling list of achievements:
- First of all, Simon was a game designer for 7 years, so he knows what it's like to be on our side of the fence :)
- He worked with Gamasutra since its early days, and then Game Developer Magazine, and was eventually Editor-in-Chief of both
- Simon created GameSetWatch, and posted there at a prodigious rate for 6 years, covering hundreds of indie games, large and small. (I was a huge fan of the site.)
- He was involved in the IGF since 2004, eventually acting as its chairman, and now as chairman emeritus. I feel that Simon really helped usher in a golden age, and made the IGF into the prominent event that it is now. And, to this day, he still helps by personally judging events like IGF China.
- He co-founded the "Indie Royale" bundle
- He worked behind the scenes organizing the Game Developer's Conference, helping to create the Independent Games Summit, which I believe has become a cornerstone of the indie community. It was the first affordable indie conference that I'm aware of, and, in my opinion, it really helped to galvanize the indie community at a crucial point in time.
- He helped to save TimW's Independent Gaming Weblog, which is now known as indiegames.com
- He helped to save MobyGames
- He now runs the Games We Care on Twitter, to help bring attention to potentially lesser-known indie games
Simon has a voracious appetite for games and game news, and an encyclopedic memory. His output during the GameSetWatch years was astounding. I could never figure out how he had time to sleep or eat. Rest assured, if you're working on an independent game that has seen even a smidgen of press coverage, he probably knows about you and your game.
I can't think of anyone who has done more for the cause of independent gaming than Simon. If you run into him at GDC, say thank you! I am 100% certain that I would not be making games now, if it weren't for his efforts. So, thank you, Simon :)
Now, this isn't to say that Simon has done all of these things alone. It's just that he has done more in total than anyone else I'm aware of. The company that he works for (UBM) also supports indies in many ways. It organizes the GDC (thanks to Meggan Scavio, her colleagues, and volunteeers), the Independent Games Summit (with help from advisors Matthew Wegner, Steve Swink, Kellee Santiago, Akira Thompson), the IGF (too many amazing former chairpersons to name, and now chaired by Kelly Wallick), and even Gamasutra, where we are right now (thanks, Christian Nutt!). UBM is a very large for-profit organization, but its gaming arm has been a benevolent, positive force for independent games. No doubt there are many other contributors at UBM of whom I am not aware, but their efforts are also very much appreciated!
The organizers of festivals, jams, and local events
There are also numerous other more local events, like game jams, train jams, and indie meetup groups that deserve thanks. I've met great friends and collaborators at events like these, and their organizers unselfishly give their time to make it all happen.
Platform Holders

With the rise of Steam, PSN, XBLA, the Nintendo eShop, and app stores, the situation today is much rosier in comparison. There are numerous competing marketplaces, and all provide relatively reasonable business terms. Those who think that 2015 is some kind of indiepocalypse are likely not comparing it to the bleak situation we endured in 2004. So, thank you Valve, Sony, Microsoft, Nintendo, GoG, Humble, Apple, Google, and others! Thank you for opening your doors.
Other helpful developers

Various developers have also taken part in documentaries like Indie Game the Movie, and GameLoading. Sure, those developers may have benefited from the exposure, but it also cost them some time and privacy, and movies like these have helped AAA gamers to become more aware of independent games in general. We all benefit from this.
Press, YouTubers, and streamers

Conclusion
We work in a challenging and stressful industry. With all of the crash bugs, financial pressures, and deadlines, it can be difficult to take a step back and appreciate all of the other people out there who are toiling away to help us. I hope that this article will help you to "break;" out of your dev loop for a moment, to enumerate your indie blessings :)
I know that I have left out or glossed over many amazing people and valuable organizations, and I apologize for that, but this article is already quite long so I'm going to end things here. Please post in the comments below if you would like to thank someone who has helped you as a developer, or someone who has helped the community at large.
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To the right is a picture of my big bald head. If you recognize me at a conference or convention, feel free to say hi!