Methods, systems, compositions and strategies for the delivery of WW domain-containing fusion proteins into cells in vivo, ex vivo, or in vitro via ARMMs are provided. Methods, systems, compositions and strategies for the delivery of cargo proteins, such as transcription factors, tumor suppressors, developmental regulators, growth factors, metastasis suppressors, pro-apoptotic proteins, nucleases, recombinases, and reprogramming factors into cells in vivo, ex vivo, or in vitro via fusion to ARMM associated proteins (e.g., ARRDC1 or TSG101) are also provided.