I thought I should make a topic where all the roms for these phones are listed, because there are so much that I can't follow them and I think I'm not the only one. :D
Please report it here in the comments if you found a rom that's not listed below, I will add it ASAP. I know that it will be very deficient, but there are too much roms.
Android 4.1.X
Stock based
B175
TouchZ by minotaurus
B176
Revolution RoM SiScOo Z by asis_92
B178
FreeYourMind by minotaurus
B179
OptimusDAY by corsoba
Daytona revolution by rubenrpi
Galaxy X by alfonso1010
B194
MeijaJB by thejaimes111
Ascend Y300 (194) by ShockeyCzT
Ascend G510 (194) by ShockeyCzT
B194 Emotion UI 1.6 by josalaito
Amarulliz ONE by alfonso1010
Soft UI v2 by shayan4shayan
B196
Ultra-light B196 by Jaccs
B196 Slim V1 by jordilopez94
Ascend Y300 (196) by ShockeyCzT
Ascend G510 (196) by ShockeyCzT
SymAnd roms by SymAnd
B197
Ultra-light B197 by Jaccs
OptimusPure by corsoba
Stratosh by stratoukos19
B199
FusionX by tillaz
Ultra-light B199 by Jaccs
Lunatic Pandora by infernape763
Gamer V2 by Jaccs
Galaxy rom by tirimosqui
iPhone rom by tirimosqui
Emotion UI 2.3 by SoI-Ieil-A
Infinity Emotion v2 by SoI-Ieil-A
Fluffy ROM by Dani 2014
SlimStock B199 by fonz93
DMore rom by davidmore
FusionX Reborn by Syssx420
Stock Pro B199 by JALEGS0528
NextGenROM by droidzone1695
B200
GamerV4 by jaccs
Lite 2X B200 by jalegs0528
B200/B200 Lite by xSergioHP.
B209
AOSP MOD by H3ROS
B209 LiteX by Jalegs
Cyanogenmod 10
Cyanogenmod 10 by josalaito
Cyanogenmod 10 by Kra1o5
Lunatic Pandora X by infernape763
XperiaTouch by Elblackfox
Jelly dark by alfonso1010
Huawei Optimus G by xuscuc
Gamer by jaccs
FluffyRom by Dani2014
FluidMOD Pandora by infernape763
Endora S by Florent 1510
RomKeny by megakeny123
CM Pure by xSergioHp
SlimCM10 by SrFarias
JellyKat Gamer by Antonio123
CM10 Gamer Style by Jaccs
MIUI
MIUIv5 3.8.23 by m80dv
MIUIv5 by william1604
MIUIv5 4.0.10 by masterpascaler
MIUIv5 by tirimosqui
MIUIv5 by az1051495
Lewa OS
Lewa OS by ErManu86
Official Lewa OS posted by paintermait
Baidu Cloud OS
Baidu Cloud OS by Mansi
Android 4.2.X
Cyanogenmod 10.1
Cyanogenmod 10.1 by Kra1o5
Cyanogenmod 10.1 by joestone
Cyano-S4 by tirimosqui
Cyanogen S4 by alfonso1010
Expert by Toliao
Cyanogenmod 10.1 by ChepKun
Endora UX by Florent1510
BlacRom by megakeny123
Cyanogenmod 10.1 by Davek_7
Zuitanes CM-Mod by zuitane
ATM CM 10.1 by JuanFran1984
Cyanogenmod 10.1 by fonz93
Xperia Z1 Rom by shayan4shayan
PAC
PAC Milestone by Ceastel
PAC B5 by Eloimuns
JellyBeer
JellyBeer v4.33 by eloygomez
JellyBAM
JellyBAM by Dark_Nightmare
Mokee OS
MokeeOS 42.2 by eloygomez
Mokee OS w/ Fly UI by tirimosqui
MIUI
MIUIv5 by tirimosqui
Endora C by Florent1510
SlimROMs
SlimROM 4.2 by Dark_Nightmare
ColorOS
Color OS by tirimosqui
AOKP
AOKP by Dark_Nightmare
Carbon
CarbonROM by luca020400 & Y300-0100
Android 4.3.X
Cyanogenmod 10.2
Cyanogenmod 10.2 by Dazzozo
Fluffy ROM by Dani 2014
Mokee OS
Mokee OS 43.1 by eloygomez
SlimROMS
SlimROM (Slimbean) 4.3 RC1 by Dark_Nightmare
Android 4.4.X
Cyanogenmod 11
Cyanogenmod 11 by Dazzozo
FluffyKitKat by Dani2014
Endora G by Florent 1510
Cyanogenmod11 by EloYGomeZ
Cyanogenmod11 by ChepKun [instructions for Y300 users]
Nebula by cyanide_cat2000
Cyanogenmod 11 by xjljian001 (Only for Dual SIM versions)
Cyanogenmod 11 by srfarias
Mokee OS
Mokee OS by eloygomez
SlimRoms
SlimKat by chil360
Slim+ by David_Vaz
Project Ara by David_Vaz
Carbon
Carbon ROM by infernape763
Carbon ROM by infernape763
Carbon ROM by EloYGomEz
Carbon ROM by luca020400
AOSB
AOSB Kitkat by eloygomez
PAC
PAC rom by Y300-0100 and eloimuns
C-RoM
C-RoM-MIX by eloygomez
XenonHD
XenonHD by infernape 763
OmniROM
OmniROM by eloimuns
AOSPA
ParanoidAndroid by EloYGomeZ
AOSPA by luca020400
LiquidSmooth
LiquidSmooth by Y300-0100
MahdiROM
MahdiROM 2.8 by luca 020400
NamelessROM
NamelessROM by chil360
Android 5.0.X
Cyanogenmod 12
Cyanogenmod 12 by luca020400
SlimLP
SlimLP by chil360
SlimLP by Mansi
Android 5.1.X
Cyanogenmod 12.1
Cyanogenmod 12.1 by fonz93
F-AOSP
F-AOSP by fonz93
TeslaOS
TeslaOSv2 by srfarias
Firefox OS
Firefox OS by infernape 763
Recoveries
TWRP by Kra1o5
CWM by Dazzozo
Philz Touch Recovery by shoxxy
Kernels (Can be unstable)
CeXstel kernel (for stock and CM) by Ceastel
Defroost kernel (for stock, CM and Lewa) by asis_92
Lirio Kernel (for CM11, Android 4.4) by IbzH
"Stock" Huawei (for stock) by moddingg33k
Slimkat kernel (for CM11) by Chil360, repacked by Dark Cricket
synopsis (for CM and SlimKat) ported by fonz93
MODs
Personalizations by pashapuma
SystemUI FC Fix by fonz93
Xperia costumizations by Redflake
4.2 Statusbar for FusionX by Victod
Brightness slider for B199 by md80v
Disable zRAM/Enable swap by Victod
Modded Huwai theme by cislaghi7
Sony Small Apps port by shayan4shayan
SwapDragonX by infernape763
Swap Script Collection by luca020400
Stock Framework MOD by Jairus1998
Y300/G510 roms to G330 for KitKat (4.4) by luca020400
APPs
Y300 Bootloader unlock, root, flash twrp app by ProHunter
GLTools by n0n3m4
Other sites and forums where the Y300's and G510's community is gathered:
Please report if you found a typo or bad link!