• Frater: The Simplest International Language Ever Constructed by Pham Xuan Thai, Internet Archive
  
• Frater: The Simplest International Language Ever Constructed by Pham Xuan Thai, Scribd
• Legabasi ot Nasion Uni (Charter of the United Nations in Frater) (pdf), Scribd
  
• Lingua Sistemfrater (Excite Blog), a blog about Frater by Igor Wasilewksi (English and Frater)
• Frater, a blog about Frater by Gary (English)
  
• Blog in Frater, a blog in Frater by Jacint (Frater)
• Lingua Sistemfrater: A forgotten IAL, a group in Reddit.
  
• Wikis: Frater in Wikipedia, Fandom (Portuguese) and Ideopedia (French)
• Frater in Twitter, by Igor Wasilewski (Frater)
  
• Frater2, revision of Frater by Paul O'Barlett
  

Other interesting conlangs

• Globasa
• Glosa
• Interglossa
• Interlingua 
• Kah
• Kotava
  
• Latino Sine Flexione 
• Lingua Franca Nova 
• Lojban 
• Neo
• Occidental
• Orba 
• Sambahsa
  
• Sona
  
• Sotos Ochando 
• Spokil
• Toki Pona 
• Universalglot
• Uropi
  
• Usik 
  
• Volapük