Text to diagram
Community list of comparisons between text to diagram tools
Modeling for Everyone
Gaphor is a UML, SysML, RAAML, and C4 modeling application written in Python. It is designed to be easy to use, while still being powerful. Gaphor implements a fully-compliant UML 2 data model, so it is much more than a picture drawing tool. You can use Gaphor to quickly visualize different aspects of a system as well as create complete, highly complex models.
Data modeling tool for NoSQL, storage formats, REST APIs, and JSON in RDBMS
Visual schema design for data-at-rest and data-in-motion: MongoDB, Cassandra, Neo4j, Elasticsearch, Avro, JSON, Parquet, Protobuf, Swagger, OpenAPI, Couchbase, Cosmos DB, Databricks, Db2, Document DB, DynamoDB, EventBridge, Glue, Hive, MariaDB, MarkLogic, MySQL, Neptune, Oracle, PostgreSQL, Redshift, ScyllaDB, SQL Server, Snowflake, Synapse, Teradata, Tinkerpop, Gremlin, CockroachDB, YugabyteDB.
PlantUML diagrams.
Easily create beautiful UML Diagrams from simple textual description. There are also numerous kind of available diagrams. It's also possible to export images in PNG, LaTeX, EPS, SVG.