Many of the 138 living languages in Malaysia are listed as endangered and some listed as powerful are undergoing language shift, mainly towards Malay, the national language, and to English, an international language. As standard Malay is the medium of instruction in the government schools, many indigenous parents are speaking Malay to their children aiming at offering them a better start in school. People in a number of the indigenous minority groups in Sabah and Sarawak acknowledge that language shift is happening and are taking steps to invert it. In the past 15 years several of the indigenous minority groups have been engaged in language development projects. This paper proposes some of the methods, activities, successes and challenges that these groups have experienced in their language development projects whilst trying to reinvigorate their vulnerable languages.