Category:Phonology
Feature:Voicing in Plosives and Fricatives WALS
Name:In fricatives alone
Languages (77):
Conlangs (66):
Livagian [phonologically]
Ayasthi
Þrjótrunn
Eridanian
Lajik
Dainyu
Sngõlpowhetet
Mavakhalan
Ainure
Tinzirean
Lhenazi

Only /s z/ contrast.
Austrian
Sjal
Nejadish
Solaric
Zanese
Nizhmel
draga
Proto-Kunnu-lujungo 
The plosives have an aspiration contrast, with voiced plosives as allophones.
Future English
Yaufulti
Rarlang
Na'vi
Jayus
Mekoshan
Neo-Fictish
Insular Kett
Zorillo

Zorillo has no voiced plosives - by Early Middle Zorillo b moved to /β/, d to /ð/ and g to /ɣ/; by Early Modern Zorillo, /β/ and /w/, /ɣ/ and /ʁ/ respectively had merged, leaving only <d> (/ð/) as a trace of the former system.
Briötto
Verunic
Miwonsha 
The voiced stops [b], [d], [g] appear only in loanwords and can be devoiced.
Luquv
Tsols Oswahe 
Voicing contrasts only exist for the labial, alveolar, and alveolopalatal fricatives.
Vishak
Platapapan
Old Zarcosian
Meino
Wally Toxic
Maraxxian
Kaidu
Dwarvish
Proto-Toroq
Afri
Indertonne
Kratish
Proto-Tampoluric 
/ɣ/ and /ʁ/ have weak friction.
Neoquux
Agyiyi
Ɣu
Diplomatic Shessith
Aalt
Dwendish
Illicraic
Random
Audhrinn
Atlam
Kavrinian
Tangachi
Least Average
PURK
Avalonian 
/f, s, x/ vs /v, z, ɣ/.
Sevzoi
Sqopran
Laadan
the I-Picked-Some-Random-Features-With-a-Die Language)
Caoli

Natlangs (11):
Mandarin
Spanish
Awa Pit
Greenlandic (West)
Guarani
Lakhota
Luvale
Nivkh
Slave
Vietnamese
Zulu