JoJo's Bizarre Adventure Part 1: Phantom Blood
http://vatoto.com/comic/_/comics/jojos-bizarre-adventure-part-1-phantom-blood-r5454
JoJo's Bizarre Adventure Part 2: Battle Tendency
http://vatoto.com/comic/_/comics/jojos-bizarre-adventure-part-2-battle-tendency-r5538
JoJo's Bizarre Adventure Part 3: Stardust Crusaders
http://vatoto.com/comic/_/comics/jojos-bizarre-adventure-part-3-stardust-crusaders-r6268
You can buy it!
JoJo's Bizarre Adventure Part 4: Diamond is Unbreakable
http://vatoto.com/comic/_/comics/jojos-bizarre-adventure-part-4-diamond-is-unbreakable-r6269
You can find the latest re-translations here: http://donebetterelsewhere.blogspot.co.uk
Side Stories:
Under Execution, Under Jailbreak contains follow up stories for Kishibe Rohan and Yoshikage Kira.
http://vatoto.com/comic/_/comics/under-execution-under-jailbreak-r5553
A further Rohan continuum can be found here
http://vatoto.com/comic/_/comics/thus-spoke-kishibe-rohan-mutsukabezaka-r5555
And the official Louvre release now has an english publication (It's very pretty)
http://www.amazon.com/Rohan-Louvre-The-collection/dp/1561636150/ref=sr_1_1?ie=UTF8&qid=1346497479&sr=8-1&keywords=rohan+louvre
And finally the Part 4 Another Day novel is undergoing translation over here
http://qpax.me/hiwamatanoboru/The%20Book%20-%20Jojo%27s%20Bizarre%20Adventure%204th%20Another%20Day/The%20Book%20-%20Jojo%27s%20Bizarre%20Adventure%204th%20Another%20Day%20-%20Chapter%201.pdf
JoJo's Bizarre Adventure Part 5: Golden Wind
http://vatoto.com/comic/_/comics/jojos-bizarre-adventure-part-5-vento-aureo-r6270
Higher quality scanlations will be coming in soon from the blog here: http://shizukajoestar.tumblr.com/
JoJo's Bizarre Adventure Part 6: Stone Ocean
http://vatoto.com/comic/_/comics/jojos-bizarre-adventure-part-6-stone-ocean-r6271
JoJo's Bizarre Adventure Part 7: Steel Ball Run
http://vatoto.com/comic/_/comics/jojos-bizarre-adventure-part-7-steel-ball-run-r6272
JoJo's Bizarre Adventure Part 8: JoJolion
http://vatoto.com/comic/_/comics/jojos-bizarre-adventure-part-8-jojolion-r4880
Speed releases are being provided as of writing by Daga Kotowaru: Check Batoto and the chan boards for these.
You can check for higher quality releases here: http://hiwamatanoboru.com/
Or from HWMN's tumblr here: http://jjlscans.tumblr.com/
Edited by Orthio, 26 December 2012 - 12:33 AM.