This abstract aims to present the ongoing work and progress of three organisations - The Turing Way, the Open Science Community Saudi Arabia, and The Carpentries - as they implement the crucial task of internationalisation and localisation of their open-source resources. The global open-source movement seeks greater inclusivity, making it essential to adapt projects to cater to diverse linguistic and cultural needs. To tackle language-specific nuances and technical terminology gaps, these organisations are implementing Translation Management Systems such as Transifex and Crowdin. These platforms facilitate peer review, enabling efficient collaborative translations akin to code development workflows. Clear communication within these systems streamlines processes, mitigating volunteer burnout and frustrations associated with manual approaches. Moreover, recognising the significance of culturally relevant translations, the organisations encourage contextualisation and establishment of shared glossaries maintained by native speakers. This approach significantly enhancines the accuracy and cultural sensitivity of the translated materials, reinforcing the commitment to inclusivity. The pivotal role of volunteers in the success of these efforts is being formally acknowledged, further strengthening the sense of community and motivation among contributors, thus promoting sustained engagement. The collective experiences of the Open Science Community Saudi Arabia, Turing Way, and The Carpentries underscores the transformative potential of Translation Management Systems in enabling scalable and collaborative multilingual resources. By embracing these insights, the broader open-source community can foster a more inclusive and culturally-aware ecosystem, ensuring open knowledge reaches every corner of the world. This work remains ongoing, and the organisations are continually refining their approaches to achieve greater effectiveness and impact.