1.1

Is there a place where we could buy some consulting for LedgerSMB?
or a minimal setup according to our specs?

Take a look at Commercial Support

Yes, its open source. The tools we use (Perl, PostsgreSQL, Apache ++) are also open source.

Open source means that the source code of the software is available for free to everyone and you can modify the code and distribute it yourself. https://en.wikipedia.org/wiki/Open_source

Look for a place to contribute. This means not only programming, but also documentation, theme design, art work, or architectural design.

Short answer: Yes

LedgerSMB can tie product sales to a tax class so that VAT can automatically be split off into the required VAT accounts on a sale, and when cancelling an invoice, automatically perform the reverse bookings.

Each product can be 'attached' to an account and the associated % will be applied automatically.

The LedgerSMB community follows the Ubuntu Code of Conduct.

Q: How could I set it up ledgersmb to support SSL connection?

SSL support on Apache is handled by configuring Apache. For having LedgerSMB connect to PostgreSQL using SSL, you can set the PGSSLMODE environment variable to 'require' in the ledgersmb.conf. Note that by default, LedgerSMB will try to connect to PostgreSQL via SSL and fall back to unsecured connections if this is not available.

We highly recommend using SSL for any access to LedgerSMB over the network.

Quite a few users find some of the terminology and accounting processes a little confusing at first. Some of the more popular small business accounting packages tend to hide these aspects of book-keeping from users for simplicity, so with the current user interface there is often some new ideas to grasp.

First step is the manual - the LedgerSMB manual is free and highly recommended reading.