Here is pretty much the list of confirmed songs that we know existed at one point but not released (although it hasn't been updated in almost a decade and some stuff have leaked since then)
The full version's of:
-St Ides Commericial(This cut's out right at the end)
-It's All About The Benjamin's(OG)(I got Kim & Biggie's verses but there clean)
-Full length version of Soul Power 197 Basement Party(I have small snippet of this as well)
The Freestyle's:
-Live On Lukes Peep Show
-No Time Freestyle
Big's Demo Tape That Was Sent To The Source:
-1. Guaranteed Raw 03:48
-2. Brooklyn shyt 04:12(he uses lyric's from the Fulton Street Freestyle,dunno if its all of them though)
-3. Don't Love No Hoe 03:39
-4. What U Want 02:52(last verse is different from released version)
-5. The Crook From The Brook 04:40
-6. bytches 02:28
-7. Biggie Smalls 03:56(a.k.a. "Biggie",not same song as used on "Born Again")
-8. Freestyle 05:40
-9. Freestyle 00:55
-10. Freestyle 04:05
Unreleased Track's Played At The Life After Death Release Party:
-ONCE UPON A TIME(Feat Fat Joe) - PROD: DERIC/RON/PUFF
-SOMEBODY ELSES GUY(Feat Lil Kim) - PROD: DERIC/RON/PUFF
-NASTY GIRL - PROD: STEVIE J/PUFF(Is This Nasty Boy?)
-STAYIN ALIVE - PROD: STEVIE J/PUFF
-HEY LOVE - PROD: STEVIE J/PUFF
-SPANISH FLY - PROD: YOGI
-ANOTHER MAN's DEALING MY TIME - PROD: PRESTIGE
-UNTITLED(Clark's Track 2) - PROD: CLARK KENT
-UNTITLED(Mo Bee Track 2) - PROD: MO BEE
-UNTITLED(Mo Bee Track 3) - PROD: MO BEE
-UNTITLED(RZA Track 2) - PROD: RZA
-UNTITLED(Premier Track 2) - PROD: PREMIER
-UNTITLED(Buc Wild Track) - PROD: BUCKWILD
And These Various Biggie Track's:
-The Original Original Version Of Long Kiss Goodnight That Was Made Before Pac Was murdered And Biggie Really Get's At Pac(Different Lyric's To The Album Version)
-Biggie Got The Hype shyt
-Blind Alley Freestyle
-I Love You(I only got a small snippet of this)
-Track with the jazz man(I only got a small snippet of this)
-Video Music Box(I got most of this I think)
-Rely On Bedstuy(This Track Is A Unconfirmed Rumour)
-Crooklyn
-Business Instead of Games
-Brooklyn Mint(The Unfinished Original Version Without Black Rob)
-Mac's & Don's(Feat Lil Kim)
-1 Track That Is Rumoured To Be Done With Black Rob and one more with Mase, as well as track's with ODB, Naughty By Nature, Onyx & Daz Dillenger
-Brooklyn's Finest Part 2(This Is Rumoured To Be In Jay-Z's Vault)
These Pre Release Version's
-Can I Get Witcha OG
-Hypnotise OG
-Last Dayz OG
-Blazing Chronic OG
-Feel The Funk OG
-Hypnotise OG
-I Got A Story To Tell OG
-Your Nobody(Till Somebody Kill's You)OG
-(Various other album OG's but there the most important)
And These Remixes
-I Got A Story To Tell Remix
-Nasty Boy Import Single Remix Dirty Version
-Can't Stop The Reign Clark Kent Remix
-Come On Mutha fukka With A Different 2nd Verse By Biggie
-Dangerous MC's(Not The Version On Born Again But The Version On The 12" Promo, There Different)