Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
OpenXava - OpenXava is a Web Java Framework for Rapid Development of Enterprise Applications.
Knack - Knack is the easiest, most spectacular business management software available.
Microsoft PowerApps - Microsoft PowerApps provides tools to create, customize, share and run apps.
Zoho Creator - Zoho Creator is a low-code application development platform that helps you build a custom, mobile-ready apps to run your business.