I like Loscil, Brian Eno (Another Green World esp.), Boards of Canada.
If you haven't already you can also download
a whole Loscil album for free on the net label one. It's ace, IMO. So still, as per the title.
Loscil's CDs are on a label called
Kranky. You can look at their website for artist names and then search
better propaganda, where most of them have a sample tune or two. "Tune". Hmm. While you're there you could check out Milosh, who sounds a lot like Boards of Canada with a singer.
Grrr... Boards of Canada. *ahem*
My favourite Eno ambient album is Ambient 4: On Land.
I like many releases on
Touch, such as Oren Ambarchi's 'Grapes from the Estate', Rafael Toral's 'Violence of Discovery, The Calm of Acceptance' and Fennesz's 'Venice'. These are all albums ostensibly by guitarists, if that makes it easier for indie hearts to accept.
Presuming you want free business, here are some other net label releases that I reckon vaguely fit the area you've described and which are certainly on a par with heaps of CD releases:
Dighom - Vibrating Colours / Coloured VibrationsGras - Gras - Site uses frames, but its catalogue number is gruen005, found under "releases"
Lomov - Vorstadt - This guy has released heaps, his
website has all the links.
Vägskäl - As Summer Comes Creeping.tape. - Sea-Scaping Monthly in 4 or 5 Movements - Links are to Ogg Vorbis files, if you want MP3s follow the link on that page to Archive.org
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Meh, that'll do. I've got more music than I can listen to
but this is what came to mind to suggest.