Do you know of any solid recommendations for project management software specifically for the creation of software? Google becomes perplexed)?
Project management is a wide subject. It is hard to give any recommendation without a specification. From simple to-do to crm, invoicing, book keeping etc. An example of the lowest level is https://web.taskio.app Good enough as an entry point IMHO.
The software development company I work for uses Jira by Atlassian for the management of our projects. It allows our team to plan, track, and release software with ease.
In addition, Jira integrates well with other internal software products, such as WFM/WFO system, CRM system and HRM system, as well as with popular tools such as Confluence, Bitbucket, and Bamboo.