The chapter provides an overview of resources and approaches and defines the major branches of online survey software. It develops a categorization schema to distinguish different software solutions in all stages of conducting an online survey, from programming to invitation, field information, and result modules with respect to the survey data life cycle model. The chapter elaborates on criteria to distinguish and judge the capabilities of different software packages, including a discussion of strengths and weaknesses. Finally, the chapter discusses ethical aspects and possible future developments in the field, for example integration with other modes, pre-testing capabilities and support for questionnaire development, and automatic documentation.