Free open source; managed via Stitch from $100/month Singer
Open-source ELT
Singer is a specification plus a free Apache-2.0 library for connecting taps and targets over Unix pipes, with self-managed operating infrastructure.
Ingestion and ELT
Managed connectors that copy SaaS and database data into a warehouse on a schedule.
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Free open source; managed via Stitch from $100/month 
Nexla
Enterprise ETL
Nexla is a data integration platform with reusable Nexsets, 1,000+ bidirectional connectors and ETL, CDC, streaming, API and RAG workflows.
Weld
Managed ELT
Weld combines ELT, SQL models, orchestration, and reverse ETL, with over 200 sources and an AI SQL agent included on every plan.
Improvado
Managed ELT
Improvado loads marketing and sales data into warehouses, harmonizes metrics with its MCDM, and provides governance, an AI Agent, and MCP access.
Supermetrics
Managed ELT
Supermetrics connects marketing data to Sheets, Looker Studio, Excel and Power BI, with about 175 connectors and Enterprise-only warehouse destinations.
Funnel
Managed ELT
Funnel combines 600+ connectors with managed marketing-data preparation, currency conversion, dashboards and unlimited users on every plan.
Adverity
Managed ELT
Adverity Connect collects, harmonizes, and monitors marketing data with 600+ connectors, four default quality monitors, and 40+ destinations.
Keboola
Managed ELT
Keboola combines data ingestion, SQL/Python transformations, scheduled flows, and Streamlit apps in a managed ELT platform.
Sling
Open-source ELT
Sling is an open-source CLI for YAML-based database and file replication, with paid API sources, scheduled CDC, and a Platform for job management.
Free allowance; Enterprise quote
CloudQuery
Open-source ELT
Self-hosted cloud infrastructure ingestion into your own database, with SQL-based inventory analysis and optional MCP access.
Data Integration from $99/month; volume-dependent
Skyvia
Managed ELT
Managed cloud data integration for SaaS applications and databases, with warehouse replication, data mapping, two-way synchronization, and visual flows.
From $1,999/month
Integrate.io
Managed ELT
Managed data pipeline platform for ETL, ELT, CDC and loading prepared data into warehouses and business applications.