Terrastruct : Terrastruct is a tool to create diagrams that excel at visually explaining complex systems, such as your organization's engineering architecture.
PlantUML : PlantUML is an open-source tool allowing users to create UML diagrams from a plain text language
code2flow : Interactive code to flowchart converter. Turn your workflows, algorithms and manuals into easy to understand diagrams via simple code.
Kroki : Convert plain text diagrams to images !
Kroki provides a unified API with support for BlockDiag (BlockDiag, SeqDiag, ActDiag, NwDiag), C4 (with PlantU...
pgLoader : pgloader loads data into PostgreSQL and allows you to implement Continuous Migration from your current database to PostgreSQL.
pgLoader has two modes ...
Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.