I have contributed in OSM and joined with Humanitarian OpenStreetMap Team in Indonesia since 2012. For more than 5 years, I have been involved in a lot of projects using OpenStreetMap in Indonesia. Some of my key contribution are:
First, I make OSM Module (as an editor) that combine basic and intermediate learning material for OpenStreetMap. At the beginning, This module was created for my coolaboration project with Wikimedia Indonesia in East Kalimantan but now after the project finished it available and free to download in https://openstreetmap.id/docs/ModulTutorialOSM25Januari2015.pdf

Secondly, I also make OSM wikimedia pages about refference objects for Indonesia Mapping. I made this page because there was misunderstanding between general page about Map features and real objects in Indonesia. So this page aimed to guide Indonesia OSM users and mapper to map right object with the right information. (https://wiki.openstreetmap.org/wiki/Id:Referensi_Atribut_Objek_OSM_Indonesia)

Thirdly, I was involved to make a document about OSM Data validation. This document now used in most of our training and we adding it to OSM wiki page as well. (https://github.com/harrymahar/indo-data-validation)