found it on one croatian news group
AudioNews.ru = The sign ups open time to time, other then that please keep the ratio well.
AOM (Art of Misdirection) = There is no exact invitation system. If you love magic and magicians, you will love the tracker as well. If you become a VIP you can ask for invitation request from the staff (once in a 6 month). But becoming a VIP is very hard!
BitHQ = Users can get invitations with BitHQ bonuses.
Bithumen = 5 star/points is equals to 1 invitation. but to collect those stars is up to your upload power!
Bit-HDTV = 10 week member, who uploaded 200 GB and has 2.05 ratio, can receive 5 invites. Other then that, you will receive one invitation every after 100gb upload. If you have 1000 credits you can exchange it to get invites. Dont forget 1000 points 5 invites.
BitGamer = the Invitation system is up to your ratio. * .90 — 1-4 GB * .95 — 4-7 GB * 1.0 — 7-10 GB * 1.05 — 10+ GB
BitMe = After 4 weeks, if you become a power user, you will receive 3 invitations. Be carefull on who you send!
BitmeTV = Power user class, can recieve one invitation every month. .But the ratios suppose to be like this ; 1 invitation :1-7GB Ratio 0.90 - 0.999 , 2 invitation :7-10GB Ratio 1.0 - 1.049 3 invitation: 10GB + Ratio 1.05+, be carefull before you send the invitaitons. Dont forget this site has some pain in the ass staff . Chose carefully.
BitShock = if you have1.05 ratio and 25 GB upload, you'll become a power user. after that you can recieve invitations.
BitSoup = There is no invitation system. they open sing-ups time to time.
BitSpyder = at least have 1.05 ratio and 15 gb upload limit. Then you will recieve invitations.
BiTT = There is no invitation system. they open sing-ups time to time.
BlackCatGames = Super users can recieve invitations time to time. Other then that, invitations close since a long time...
BTMusic (Pedro’s) = Minimum 100 days membership and over 10 gb upload. Also your ratio suppose to be 0.8 or over. If you can make it, you will recieve 2 invitations.
ChildBytes = There is no invitation system. they open sing-ups time to time.
ChristianTorrents = Power users can get 1-3 invitations in one week.
Cinemageddon = Right now, its open go go go go. but sing-ups are open time to time.
Cinematik = have a good ratio and good upload number. you will see nice things
CZone = there is an auto system for invitations. no specific invitation sytem.
DeepBassNine = unknown, but people say, its hard to get invitations from this tracker.
Demonoid.com = With invitation codes, you can be a member. You can find them easly everywhere.
DesiTorrents = There is no invitations for this tracker. only recruitments.
Docs.torrents.ro = Invitations are closed. Might get open, might get not.
DVDSeed.org = Invitation system is open in specific times. But in the future, they might close it all.
Elektronik = You need 200000 points. To get points you must upload torrents or seed by hours. Seeding hours will only affect 0.5 each hour. Also after you become a power user, you deserve one invitation.
Ethor.et (Thor’s Land) = If you are a elite user, you might get invitations.
EVOPT = Invitations are open time to time. You need 1.05 ratio and 25 gb upload to get invites.
FileList.org = There is no invitation system. they open sign-ups time to time. however, they closed it a while ago. If you become a member, its hard to get ban.
FinBytes = You need at least 1.00 ratio and 15 GB over upload to get invites.
FTN = Invitations are closed! . if they open, only donators or "hero" class members can have invitations.. If you want to be a hero, you need to upload 1 tb.
FSC = Some people say, the invitations are closed but however registrations are happening. Probably only staffs have invitations or who helped the tracker alot get invites. if you can manage to get invitation, you need to be a power user and you have to be a active in forums. They might open the invitations with a freeleech in a close time.
(FT**) = You need to be at least super user or power user. They have invitation request section. . You need to have some good lettering for applying to the invitation. if you are lucky you will get invited.
Full Contact Zone = Every month they give invitations to diffrent classes. At least have 0.9 ratio and good upload/download numbers. They open sing-ups time to time.
FunFile = They have credit system. 100 credit is 1 invitation. However, they open sign-ups time to time.
GFXNews.ru = There is no invitation system. They give dates before they open the sing-ups.
GFT = you have to donate to get invites, 5 euros for each invite.
GOEM = If you are a power user, you will get 1 invitation every week.
Greek-Tracker = There is no invitation system. they open sing-ups time to time.
Hdbits.org = I dont know
HeavenTracker = Some times they open the sign-ups, sometimes they give invitations to power users. However, now only staff has invitations.
HHBase = They open sing-ups time to time. Right now its open!
iDesiR = After you become a one month member, if you have write 100 posts in the forums and if you have 25 gb upload or over 25 gb upload and if your ratio is over 2, you will recieve 2 invitations. Or you have to become a vip member to get invites.
ILoveTorrents = They open sing-ups time to time.
IndieTorrents = You need to become a member at least 1 month, if possible please be in the uploader class users. in this point, if your ratio is over 1 point, you will recieve 1 invite.
Iplay = Donation = 9E=1 Invite .There is no auto system. uploaders can request invitations from the staff.
IPWN Music (filescene.ro) = Back then, only staff had invitations... but now, everyone has invites.
ITS = Powe users or over can request invites. Staff will evaluate your request, and decide. One person can only invite 20 people.
Kraytracker = Power user can get invitation in one moth maximum 2 , VIPs in 2 weeks max 3 , if you are over VIP you can get 4 invites in 2 weeks.
KaraGarga = At least 12 week membership, You need to become power user, at least (50 GB) and 1.05 ratio.
Libble = 200 points means 1 invitation. By seeding you can get points.
Linkomanija = Only donators can get invites.
MetaliPlay.ro = 900 bonus 1 invitation.
MMA Tracker = They closed invitations since last fabruary.
Music-Vids = VideoAddict & VideoManiac classes can request invitations and the staff will decide, VIP & VideoHolic classses can recieve 1 invitation a month, VideoLegend can get 2 invites a motnh.
My Bloody Tracker = Yo can get invites over your seedhours.
MySpleen = Donators and power users can get invitations.
NB = Power users and bigger classes can get invitation after 180 days and only once. Other then this only norwegians can request and recieve invites from staff. They have to request in norwegian.
nCore = 1 invitation 500 points.
NTorrents = at least have 1.05 ratio and 20 gb upload to get an invite.
PiSexy = There is no invitation system. they open sing-ups time to time.
PirateBits = Invitation system is open. But you better know Swedish.
PTN = Carpenter and over classes can request invitations. After the staff will evaluate your request. You can only become a Carpenter if you have 200 gb traffic.
PolishTracker = You have to be L33T or over userclass . that means you have to have at least 2 tb upload. if you donated money you can get invites too.
PREtorians = 2000 GB upload means 1 invitation. or become a power (25 GB upload , 4 week membership and atleast have 1.05 ratio) . In the forums you can only request once for invitation.
Pretome = You need to use your credits to get invites.
ProAudioTorrents = Its up to how you seed.
RevTT = 25 GB upload limit and 4 weeks membership, then you can be a power user and recieve 2 invites. After, you can request invites in forum. Donators will recieve 4 invites.
RsR (ShareReactor.ro) = Only power users can recieve invitations.
SnowTigers = There is no invitation system. they open sing-ups time to time.
SoftMP3 = After you improve your user class, you will recieve invites.
Spank D Monkey = You can get invites if you have good karma.
SweDVDR = at least 30 week membership and you have to be Divine user class. Site is closed to other then swedish people.
STMusic = If you get invite to this tracker you will recieve 2 invites. After you become a power user, you will have invitations.
ScT = Whoever donates, will get the invites. 20 Euro: 1 invite 30 Euro: 2 invites 50 Euro: 4 invites
Scc = you need to donate in SCC to get invites. 10 Euros=10gb upload and 1 invite, 20 Euros 30gb and 2 invites, 30 Euros= 50gb and 3 invites, 50 Euros= 100gb and 4 invites
ScL = whoever has 100 GB upload or over and whover in Corporal class can request invites in forum. They gave too much in this days
SceneFZ = Whoever donates, will get the invites. - 20 Euros = 2 invites ; 40 Euros = 4 invites; 60 Euros = 6 invites.
SuperTorrents = jumping classes will get you invites.