From another board -- modified to leave out crap and inaccuracies:
Carbonized - For The Security. Swedish death mixed with grind. Very interesting.
Carnage - Dark Recollections. A total must-have for anyone who likes early Entombed and Dismember. This is basically the 3rd best album after "Left Hand Path" and "Ever-Flowing Stream."
Cemetary - An Evil Shade of Grey. This debut is very cool, melodic and atmospheric but still clearly death metal. Afterward they started to suck.
Desultory - Into Eternity. Good 2nd tier Stockholm death metal. Riffing is about as much thrash as death but the vocals are first class and the melodies are good. Their demos are also good.
Dismember - basically everything. Their greatest album is "Like an Ever-Flowing Stream," which to me is the best thing on this list and maybe the best death metal album ever.
Entombed - Left Hand Path, Clandestine, Crawl. You know at least one of these. "Left Hand Path" is a monument. "Crawl" is a great little EP with a different vocalist.
Evocation - Evocation. Demo comp from a Stockholm also-ran band. They recently reformed and did an album, which pales in comparison to these well-produced demos. -- never heard
God Macabre - The Winterlong. Super heavy, tremendous album.
Goddefied - Abysmal Grief. Soon to be reissued by Blood Harvest, this sounds a lot like early Dismember. The band's also together again and working on an album to follow up this EP. -- does this suck?
Gorement - Darkness of The Dead. Somewhere between Darkified and God Macabre.
Grave - Into The Grave, You'll Never See. The ugly monster in the basement of Swedeath. These albums are both so nasty and brutal, they're must-haves. -- always thought these were boring
Grotesque - In The Embrace of Evil. A black/death standard setting band. You can get this on CD with At the Gates's "Gardens of Grief."
Interment - Conjuration of The Sepulchral. Part of a split with the Finnish-sounding band Funebrarum. Great split in all, but Interment's half is the best part: total old school sound. They're reunited and working on a new album too. -- never heard
Necrophobic - The Nocturnal Silence. Blackened death similar to Bloodstone - or imagine Dismember mixed with Dissection, maybe. Very good.
Nihilist - demos. Available on CD. These demos basically created the Swedish death sound.
Paganizer - No Divine Rapture. The frontman for this is involved in Ribspreader and Demiurg also. All these bands are kind of samey to me, so this is just a representative selection. If you like it, check out his other projects.
Seance - ForNever Laid To Rest. Atypical sound for a Swedish band (closer to some US styles really), but very very good and strongly recommended. Some swear by their second album too, but I don't.
Therion - Of Darkness, Beyond Sanctorum, and Ho Drakon Ho Megas. Like a melodic Mercyful Fate taking on heavy Celtic Frost death metal.
Unanimated - In The Forest of The Dreaming Dead, Ancient God of Evil. Dismember meets Dissection.
Uncanny - Splenium For Nyktophobia. This is edging into tech death territory but the album is so great (and so woefully obscure) that I have to recommend it at every opportunity.
Unleashed - Shadows In The Deep, Where No Life Dwells. Meat-and-potatoes death metal with catchy, basic song structures and riffs.
Utumno - Across The Horizon. Now HERE is the best EP in Swedish history, to me at least. It's 2/3 standard Swedish death, and 1/3 something else entirely... big, atmospheric riffs; interesting and kind of philosophical lyrics. The really unusual cover art says it all. Vic Records is supposed to be preparing a reissue.
Don't forget Sacramentum.